Mordekaiser

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Data93 pro games·Feb 2022 – Oct 2026·patches 12.2–26.20·CBLOL, LCK, LCO Split, LCP, LCS, LEC, LJL, LLA, LPL, LTA, MSI, PCS, VCS, Worlds· incl. international·Browse source →

Comp identity — Top

Leans Catch — its strongest of the five comp axes.

Plays like — nearest pentagon

Ranked by how close their five-axis heatmap looks — role-agnostic.

Where it thrives (5-comp fit)

Catchnatural · 60%
Splitnatural · 60%
Attackworkable · 40%
Mordekaiser follows up fast when the enemy missteps. Enough Split and Attack sits in the kit to threaten a side lane once the map opens. W Indestructible banks a shield from damage dealt and taken (capped at 30% max HP) and can be recast to convert it into a heal instead.

Kit quirks

W Indestructible banks a shield from damage dealt and taken (capped at 30% max HP) and can be recast to convert it into a heal instead
R Realm of Death banishes a single enemy champion into an isolated 1v1 arena for 7s, stealing a percentage of their stats and healing Mordekaiser off their max HP
Passive Darkness Rise adds on-hit magic damage and stacks into a periodic max-HP-scaling damage aura, rewarding sustained auto-attacking in extended fights

How Mordekaiser actually performs in ranked solo queue · 26 weighted games

Solo queue strength

Top51% WR · 24.0 games
Mid51% WR · 1.1 games
Jungle50% WR · 0.9 games
Bot50% WR · 0.0 games

Strongest duos

Not enough paired games yet.

Best matchups

No favored matchups recorded.

Hardest matchups

No losing matchups recorded.

Champion reference

Base stats and every ability with its per-rank values and ratios. Search all champions →

Mordekaiser (Sahn-Uzal) — The Iron Revenant

Class: Juggernaut
Resource: Shield
Range type: Melee
Adaptive type: Magic
Positions: Top
Released: 2010-02-24 (V1.0.0.75)
Last changed: V26.20
Price: 675 BE · 585 RP

Damage

Toughness

Control

Mobility

Utility

Difficulty

Base stats

Stat	Base	Per level	Level 18
Health	645	+104	2413
Health regen (per 5s)	5	+0.75	17.75
Armor	37	+4.2	108.4
Magic resist	32	+2.05	66.85
Attack damage	61	+4	129
Attack speed	0.625	+1%	0.731
Attack speed ratio	0.625
Attack range	175
Movement speed	335

Level 18 uses League's growth curve (base + 17 × per-level); attack speed grows as bonus % scaled by the attack speed ratio.

Advanced stats & game-mode balance

Acquisition radius: 400
Selection height: 190
Selection radius: 125
Pathing radius: 35
Gameplay radius: 80
Attack cast time (s): 0.5
Attack total time (s): 2.366
Attack delay offset: -0.1

ARAM: damage dealt ×1 · damage taken ×1

One for All: damage dealt ×0.95 · damage taken ×1.05

URF: damage taken ×0.85

Ultimate Spellbook: damage taken ×1.05

Abilities

Passive

Darkness Rise

Effect radius: 375

Innate: Mordekaiser's basic attacks are empowered to deal 40% AP bonus magic damage on-hit.

Innate: Mordekaiser generates a stack for each enemy champion or large monster damaged by his basic attacks or hit by his basic abilities, lasting for 4 seconds, refreshing on subsequent triggers, and stacking up to 3 times. At 3 stacks, he gains Darkness Rise.

Darkness Rise: Mordekaiser gains 3% / 6% / 9% (based on level) bonus movement speed and deals「 5 (+ 30% AP) (+ 1% – 5% (based on level) of target's maximum health) magic damage every second 」「 0.625 (+ 3.75% AP) (+ 0.13% – 0.63% (based on level) of target's maximum health) magic damage every 0.125 seconds 」to nearby enemies. Against monsters, the damage is capped at「 40 – 200 (based on level) per second. 」「 5 – 25 (based on level) per 0.125 seconds. 」

Targeting input: PassiveAffects: Self / EnemiesDamage type: See NotesDamage sub-types: MagicSpell shield: Not BlockedParries: Blocked

Damage details (2)

Darkness Rise: On Hit — Magic damage
Tags: Proc damage
Properties: ApplyDamageModifier, ApplyLifesteal, ApplyOmnivamp, EnableCallForHelp, EnableKill, RespectDodge, RespectImmunity, TriggerDamageEvents, TriggerOnHitEvents
Darkness Rise: Aura — Magic damage
Tags: Ability damage, Area damage, Periodic damage
Properties: ApplyDamageModifier, ApplyLifesteal, ApplyOmnivamp, EnableCallForHelp, EnableKill, RespectDodge, RespectImmunity, TriggerDamageEvents, TriggerOnHitEvents

Notes (11)

Darkness Rise deals persistent area damage damage around Mordekaiser, while the bonus damage on his basic attacks is proc damage.
Darkness Rise's bonus damage on-hit is not applied against structures.
Mordekaiser has a stack counter under his health bar that is not visible to other champions. It will light up when the maximum effect is active.
Mordekaiser will still generate Darkness Rise stacks from hitting his abilities even if they deal no damage, such as if the target is invulnerable or blocks an ability with a spell shield.
Basic attacks do not generate a stack if their damage event does not happen due to the target being invulnerable, or the attack being dodged, blocked, or missed while Mordekaiser is blinded.
Dusk and Dawn's Spellblade on-hit event is special cased to generate an additional Darkness Rise stack.
The on-hit event is not triggered if the triggering attack is dodged, blocked, or missed while Mordekaiser is blinded, thus not generating a Darkness Rise stack. It is still triggered against invulnerable targets, generating a Darkness Rise stack.
Darkness Rise's area damage alone does not refresh Darkness Rise's buff.
If Darkness Rise is activated through either Obliterate or Death's Grasp, it will be treated as the same cast instance as the triggering spell.(bug)
Under these conditions, Darkness Rise will fail to interact with effects that only do so once per cast instance (e.g Conqueror), but will interact with effects such as Spear of Shojin's Focused Will's stacking, which would normally not interact with innate abilities.[1]
Darkness Rise's damage will be grouped with the triggering spell's damage in the death recap.[2]

Obliterate

Cooldown: 8 / 7 / 6 / 5 / 4Cast time: 0.5Range: 22.5 - 625Width: 90 - 150Queue threshold: 0.275

Active: Mordekaiser strikes his mace down in a line in the target direction, dealing magic damage to enemies within, increased if only one enemy is hit.

Magic Damage: 0 – 77 (based on level) (+ 80 / 115 / 150 / 185 / 220) (+ 120% bonus AD) (+ 70% AP)
Isolated Damage Increase: 30 / 35 / 40 / 45 / 50%

Targeting input: DirectionAffects: EnemiesDamage type: See NotesDamage sub-types: MagicSpell shield: BlockedProjectile: Not Blocked

Damage details (2)

Obliterate: Multi-Hit — Magic damage
Tags: Ability damage, Area damage
Properties: ApplyDamageModifier, ApplyLifesteal, ApplyOmnivamp, EnableCallForHelp, EnableKill, RespectDodge, RespectImmunity, TriggerDamageEvents, TriggerOnHitEvents
Obliterate: Isolated Hit — Magic damage
Tags: Ability damage
Properties: ApplyDamageModifier, ApplyLifesteal, ApplyOmnivamp, EnableCallForHelp, EnableKill, RespectDodge, RespectImmunity, TriggerDamageEvents, TriggerOnHitEvents

Notes (11)

This ability always employs Quick cast.
This ability will cast from wherever the caster is at the end of the cast time.
The ability will cast to wherever the caster's cursor was at the start of the cast time.
If Mordekaiser's location changes during the cast time, the visual effects of Obliterate will be divided into three sections: one forming toward the caster's cursor at the start of the cast, one forming toward the original cast direction, and one following Mordekaiser's facing direction. Only the first will portray the spell's effect accurately.(bug)[3]
Applies spell damage if it hits one target and area damage to multiple targets.
Obliterate's damage against isolated enemies at:
Rank 1: 104 – 204.1 (based on level) (+ 156% bonus AD) (+ 91% AP)
Rank 2: 155.25 – 259.2 (based on level) (+ 162% bonus AD) (+ 94.5% AP)
Rank 3: 210 – 317.8 (based on level) (+ 168% bonus AD) (+ 98% AP)
Rank 4: 268.25 – 379.9 (based on level) (+ 174% bonus AD) (+ 101.5% AP)
Rank 5: 330 – 445.5 (based on level) (+ 180% bonus AD) (+ 105% AP)

Indestructible

Cooldown: 12 / 11 / 10 / 9 / 8Cast time: noneQueue threshold: 0.25

Passive: Mordekaiser stores 45% of the post-mitigation damage he deals and 7.5% of the pre-mitigation damage he takes,「 reduced by 75% for non-champion sources, 」「 reduced to 11.25% of damage dealt and 1.875% of damage taken for non-champion sources, 」as Potential Shield on his secondary resource bar, up to 30% of his maximum health. The Potential Shield decays by 8 – 25 (based on level) every second after not dealing or taking damage for 1 second. While Indestructible is not on cooldown, the Potential Shield will not decay below a minimum of 5% of his maximum health, and it will be set to that amount when it comes off cooldown if it was previously below it.

Active: Mordekaiser consumes his Potential Shield to grant himself a shield for the same amount for 4 seconds. The shield decays exponentially over the duration. Indestructible can be recast after 0.5 seconds while the shield is active.

Recast: Mordekaiser consumes the remaining shield, healing for a portion of the amount.

Shield to Healing: 35 / 37.5 / 40 / 42.5 / 45%

Targeting input: AutoAffects: Self

Notes (3)

Both casts count as ability activations for the purposes of on-cast effects such as Spellblade and triggering Force Pulse's passive.
The recast will heal Mordekaiser for a minimum of 1.75 / 1.875 / 2 / 2.125 / 2.25% and up to 10.5 / 11.25 / 12 / 12.75 / 13.5% of his maximum health.
It also effectively converts 15.75 / 16.875 / 18 / 19.125 / 20.25% of damage dealt and 2.625 / 2.8125 / 3 / 3.1875 / 3.375% of damage taken, reduced to 3.9375 / 4.2188 / 4.5 / 4.7813 / 5.0625% and 0.6563 / 0.7031 / 0.75 / 0.7969 / 0.8438% for non-champion sources respectively.

Indestructible

Cooldown: 12 / 11 / 10 / 9 / 8Cast time: noneQueue threshold: 0.25

Recast: Mordekaiser consumes the remaining shield, healing for a portion of the amount.

Shield to Healing: 35 / 37.5 / 40 / 42.5 / 45%

Targeting input: AutoAffects: Self

Notes (3)

Both casts count as ability activations for the purposes of on-cast effects such as Spellblade and triggering Force Pulse's passive.
The recast will heal Mordekaiser for a minimum of 1.75 / 1.875 / 2 / 2.125 / 2.25% and up to 10.5 / 11.25 / 12 / 12.75 / 13.5% of his maximum health.
It also effectively converts 15.75 / 16.875 / 18 / 19.125 / 20.25% of damage dealt and 2.625 / 2.8125 / 3 / 3.1875 / 3.375% of damage taken, reduced to 3.9375 / 4.2188 / 4.5 / 4.7813 / 5.0625% and 0.6563 / 0.7031 / 0.75 / 0.7969 / 0.8438% for non-champion sources respectively.

Death's Grasp

Cooldown: 16 / 14 / 12 / 10 / 8Cast time: 0.25Target range: 700 • 900Effect radius: 800 • 200Width: 200Speed: 3000

Passive: Mordekaiser gains magic penetration.

Magic Penetration: 5 / 7.5 / 10 / 12.5 / 15%

Active: Mordekaiser summons a claw in the target direction that grants sight of the area. After 0.5 seconds, it deals magic damage to enemies within and pulls them over 250 units.

Magic Damage: 60 / 80 / 100 / 120 / 140 (+ 45% AP)

Targeting input: LocationTarget out-of-range override: Target at maximum range (clamped)Affects: Self, EnemiesDamage type: Area damageDamage sub-types: MagicSpell shield: BlockedProjectile: Not Blocked

Damage details (1)

Death's Grasp: Claw — Magic damage
Tags: Ability damage, Area damage
Properties: ApplyDamageModifier, ApplyLifesteal, ApplyOmnivamp, EnableCallForHelp, EnableKill, RespectDodge, RespectImmunity, TriggerDamageEvents, TriggerOnHitEvents

Notes (3)

Death's Grasp will still pull even if Mordekaiser dies.
Death's Grasp will only be visible from the enemy team's perspective if it is at least 300 units into their sight.
This ability will cast from wherever the caster is at the start of the cast time.

Realm of Death

Cooldown: 120 / 110 / 100Cast time: 0.5Target range: 650Effect radius: 1200Queue threshold: 0.25

Active: Mordekaiser aims his mace towards the target enemy champion, slowing them by 75% and revealing them over the cast time, and then banishing them with him to the Death Realm for 7 seconds. Mordekaiser also consumes the target's soul for 7 seconds, healing himself for 10% of their maximum health and reducing their current ability power, total attack speed, maximum health, armor, magic resistance, and size by 10% for the duration. Additionally, the target's base attack damage is reduced by 10% of their current total AD for the same duration. Mordekaiser gains the reduced stats of the target for himself for the same duration, and if the target dies while inside the Death Realm, he keeps their partial stats until they respawn.

Units between realms see each other as spirits, considering each other dead and negating any interactions between each other. Only Mordekaiser and the target will enter the realm; other champions cannot follow them. Everything that occurs inside the Death Realm is hidden to units outside of it, and vice versa. Most pets still inside the realm are killed at its end.

When the Realm of Death ends, all affected champions are returned to the normal realm. The Realm of Death ends prematurely if either affected champion dies or is forced out of the realm.

Targeting input: UnitTarget out-of-range override: Walk in range of the target unit to castAffects: EnemiesSpell shield: See Notes

Damage details (1)

Realm of Death: Health Reduction — True damage
Tags: Default damage
Properties: ApplyDamageModifier, ApplyLifesteal, ApplyOmnivamp, EnableCallForHelp, EnableKill, RespectDodge, RespectImmunity, TriggerDamageEvents, TriggerOnHitEvents

Notes (163)

The Death Realm is a battlefield that exists outside of the normal realm in an alternate "dimension". It exists only for Mordekaiser and his target. It consists of an arena that has a radius of 1200 units and includes any terrain features that would exist in the map of the normal realm, including walls and brushes.
Structures exist in all realms at the same time. Turrets will behave normally as if all units were in the same realm.
The boundaries of the arena are impassable but not considered terrain themselves ( Unstoppable Onslaught exception), and enemies that try to move out of the area will be displaced back inside.
Dashes, blinks, displacements and other forms of movement will cap their effect range to the boundary. Targets will stop at the boundary even after it expired.
During the cast time of Realm of Death, it is possible to pathfind outside the boundaries of the arena by issuing a movement command toward an area that becomes inaccessible due to terrain inside the Death Realm.(bug)[4]
Realm of Death retains Mordekaiser's previous current health percentage when granting him a portion of the target's maximum health.
Realm of Death's healing is affected by healing modifiers.
Realm of Death's target will be marked by Mordekaiser for assist credit when entering the Death Realm.
Realm of Death does not trigger in-combat effects.
Realm of Death will cancel and go on cooldown after its cast time if:
The target is displacement immune, crowd control immune or protected by a spell shield.
Note that all of the above are ineffective if they are applied after the target has been banished.
The target is a clone or Sion when his Glory in Death is active.
If the target becomes untargetable, dies, is too far away or Mordekaiser loses sight of them due to nearsight during the cast time, this ability will cancel but does not go on cooldown.
If either Mordekaiser or the target dies at the same time of the transition into the Death Realm, the Death Realm will not end prematurely and will continue until its full duration has ended.(bug)[5]
If the target dies this way, Mordekaiser will not keep their stats after leaving the Death Realm.
Tahm Kench's Devour will always trigger this bug if used during the cast of Realm of Death and the spit would kill Mordekaiser.[6]
If Mordekaiser or the target cast another Realm of Death, the affected champions will remain stuck for the duration of the new circle.
The previous circle will be overridden by the new one; it will be dispelled to enter the new circle.
Spell shield will not block the initial slow.
The reveal effect lasts for 1.25 seconds from the start of the cast time if the cast does not complete. Otherwise, the reveal ends as soon as the cast time completes.
Upon entering or leaving the Death Realm, targets revealed by effects such as Ignite or Ashe's Hawkshot will keep the reveal VFX but will stop being revealed.(bug)[7]
Camouflaged units will become visible if an enemy champion is within their detection range, even if the champion is in a different realm.(bug)
If the target's current health is lower than the amount that should be stolen, they will be brought down to 1 health. Mordekaiser will still get the intended amount of maximum health.
Realm of Death's maximum health reduction ignores invulnerability effects.
Entering or leaving the Death Realm will cause all targeted projectiles to be destroyed.
The transition in and out of the Death Realm doesn't interrupt channels.
Grand Starfall will always be interrupted by the transition into the realm.
Realm of Death will not be dispelled if either of the two affected champions enter resurrection after taking lethal damage. It is dispelled if the target enters a zombie state.
Any active tether effects (both friendly and hostile ones) existing on either of the two champions entering the realm will be broken (unless the tether is between those two).
Upon entering the realm, Mordekaiser and the target are cleansed from all forced action effects.
The cleanse will occur even if the source of the crowd control enters the realm.(unexpected)
Unlike the other stats, Mordekaiser does not steal enemy total size; instead he gains 10% of his own size and reduces the enemy's size by 10% of theirs (all size modifiers stack additively).
Mordekaiser grows in size over 0.25 seconds after successfully stealing his targets' stats, and shrinks over 0.25 seconds after the buff runs out again. The target shrinks over 0.25 seconds after their stats are stolen, but grows back to normal size instantly when the effect ends.
While Mordekaiser has hold of his enemy's stats, that champion's circular portrait will appear as a pip next to his health bar, visible to all players.
The champion's portrait will ocasionally stay even after Mordekaiser has lost hold of the enemy's stats.(bug)
Realm of Death's interactions with other elements/abilities (This list might be incomplete, last updated on patch V26.16):
Multiple Death Realms (possible through a hijacked Realm of Death or if multiple Mordekaisers are in the same match) spawned will exist in the same realm, allowing champions to see and interact with champions bound to other circles. Champions are only affected by their boundaries and are not able to see the others.
If another Realm of Death is cast while one is already active, upon leaving, the spirits from the second Realm of Death will be invisible from the perspective of the players affected by the first Realm of Death.(bug)[8]
Tahm Kench's Devour can carry a target outside of their circle, but they will be displaced back inside once Regurgitated.
An active Cease and Desist on a target outside the perimeter will cause Vi to continue her charge until her circle ends. She can knock back and damage secondary targets multiple times.
Champions inside the Death Realm continue gaining gold and experience from any source, which includes nearby and global bounties as well as neutral buffs.
Turret's Crystalline Overgrowth can still be triggered while inside the Death Realm.
The Overgrowth's VFX of the Outer Turrets (Tier 1) will be invisible inside the Death Realm.(bug)[9]
Wards placed in the Death Realm will not be destroyed at its end.
The ward limit for each champion will be separate for the Death Realm.
The faelights and jungle plants ( Blast Cone, Honeyfruit, Scryer's Bloom) will not be present in the Death Realm.
The faelights indicator will still be visible if the player's cursor is placed in their location.(bug)[10]
The Blast Cone's landing indicator will still be visible while in the Death Realm and within its range.(bug)[11]
Monsters, with the exception of Voidgrub's, will be visible for a brief moment after entering the Death Realm, but they will be untargetable.(bug)[12]
Hex-gates on Hextech Rift will not be present between realms.
Eye of the Herald and Teleport are disabled while in the Death Realm.
Using Unsealed Spellbook to obtain Teleport while in the Death Realm will enable the user to use it.(bug)
Using Unsealed Spellbook to swap Teleport for another summoner spell while in the Death Realm will disable the new summoner spell until the user leaves the realm.(bug)[13]
The Eye of the Herald can still spawn in the Death Realm if its automatically consumed while inside.(unexpected)
The Herald will die at the end of Realm of Death.
Controllable pets and clones can still be commanded between realms.
Mordekaiser will be given gold, if applicable, for pets killed at the end of Realm of Death.
Clones and Illaoi's Tentacles will not be killed at the end of Realm of Death.(unexpected)
Annie's Tibbers, Heimerdinger's H-28Q Apex Turret, Ivern's Daisy and Yorick's Maiden are considered as "large pets" for the purposes of this ability and will follow their respective champions between realms.
If Mordekaiser dies inside of the Death Realm while his Darkness Rise is hitting any of these pets, Darkness Rise will keep affecting the pets until they die or Darkness Rise deactivates normally.(bug)[14]
Switching realms detaches all attached champions on either of the two champions entering the realm.
The allied health, resource, and ultimate indicators (champion portraits located on the screen) will not update between realms as the players have no vision of them.
Pings used in the Death Realm will appear in the chat and mini-map, but will not appear in the map.(unexpected)
Any spawned terrain while in the Death Realm will remain inside until expired. They will not be destroyed.
Except for some cases, spells that require a target to be cast (e.g Akali's Shuriken Flip, Twitch's Contaminate) will not affect enemies in other realms nor will be castable if there's no targets in the same realm as the caster.
Amumu's Bandage Toss, Blitzcrank's Rocket Grab, Leona's Zenith Blade, Nautilus' Dredge Line, Pyke's Bone Skewer and Thresh's Death Sentence will still hit targets if their caster switches realms before they hit.
Camille's The Hextech Ultimatum, Dr. Mundo's Goes Where He Pleases, Nunu & Willump's Biggest Snowball Ever! and Absolute Zero, Pyke's Death from Below, Ryze's Realm Warp, Shen's Spirit's Refuge, Taliyah's Worked Ground and Zed's Shadows will follow their caster between realms.
Braum's Glacial Fissure[15], Pantheon's Grand Starfall*[16], Singed's Mega Adhesive[17], Varus' Hail of Arrows[18], Yasuo's Wind Wall[19], Ziggs' Satchel Charge*[20] and Zilean's Time Bomb*[21] will follow their caster between realms but will only be visible in the realm they were cast.(bug)
Ahri's Orb of Deception will stay in the realm it was cast.
The orb will still go back towards Ahri's position.
Akshan's Avengerang will stay in the realm it was cast.
The boomerang will only go back towards Akshan's position if it was already doing so during the realm switch.
Akshan's Comeuppance bullets will get destroyed if he switches realms, even if its target is Mordekaiser.
Anivia's Glacial Storm will not be dispelled if Anivia switches realms, but it will only be present in the realm it was cast.
Aatrox's Infernal Chains tether will be destroyed if his target switches realms.
Bel'Veth's Void Corals will only be present in the realm they spawned in.
If Bel'Veth switches realms while she is consuming a Void Coral, the Void Coral will dissappear and she will not get her True Form nor deal damage to nearby enemies.
Camille will still be able to use Hookshot's dash if she switches realms before the spell hits.
Ekko's Parallel Convergence will only be visible in the realm it was cast, but he will still be able to trigger the spell's effect from another realm and it will only affect enemies in said realm.(bug)[22]
Fizz's Chum the Waters will follow its target between realms.
Galio's Winds of War will follow him if the spell was already on the ground before the realm switch, but it will only be visible in the realm it was cast.(bug)[23]
Gnar's Boulder Toss boulder will only be visible in the realm it was cast, but he can still pick it up if he goes to its location.(bug)[24]
Illaoi's Test of Spirit tether will be destroyed if her target switches realms.
Test of Spirit's target will not be made into a Vessel.
Irelia's Flawless Duet will be recast automatically when switching realms, and will only affect enemies in the realm it was cast.
Ivern's Rootcaller can still be recast if the target is in a different realm than him.
Ivern's Brushmaker brushes might be visible for a few seconds after switching realms.(bug)[25]
Passing by the position of a brush created by Brushmaker in another realm will make units transparent for a few seconds, but they will still be visible to the enemy team.
Jarvan IV's Cataclysm deactivation VFX will appear in the realm he is at.
Kai'Sa's Killer Instinct can only be cast towards enemies in the same realm she is at.
Kalista's Fate's Call cannot be cast if her oathsworn is in another realm, but if the spell was cast before entering the Death Realm, it will function as normal and will only affect targets in the oathsworn's realm.
Karthus' Requiem will damage enemies in all realms.
Kayn's Umbral Trespass will be interrupted and will not deal damage if its target switches realms.
Kog'Maw's Void Ooze will follow him between realms.(bug)[26]
A part of the VFX will be left in the realm it was cast.
Lillia's Lilting Lullaby will only affect enemies in the same realm as her.
Lissandra's Glacial Path can still be recast if the spell was initially cast in another realm.
Lulu's Pix will follow her between realms.
However, if Pix is on another champion, it will visually stay in Lulu's realm but will keep affecting enemies in the Death Realm.(bug)[27]
Pix will still be able to return to Lulu as normal, even if her ally's still in the Death Realm.
If Locke's Purgatory's totem is in the ground, it will follow Locke between realms.(bug)
If the totem closes in a different realm than Locke, the totem will be visible in Locke's realm but it will only be pickable in the realm it closed.(bug)
Lux's Prismatic Barrier will grant her its second shield if she switches realms as the wand is coming back.
Lux's Final Spark will follow her between realms.
The beam's VFX will only be visible in the realm it was cast.(bug)[28]
Malzahar's Void Shift is special cased to not resist the slow but instead resist the realm switch after the cast completes.
Malzahar's Call of the Void will follow him if used moments before the realm switch. Also, a part of the VFX will be left in the realm it was cast.(bug)[29]
Mel's Golden Eclipse will only deal damage to enemies in the same realm she is at the end of the cast.
Miss Fortune's Make It Rain will follow her between realms.(bug)[30]
The spell's area VFX will not follow.(bug)
Naafiri's Hounds' Pursuit dash will still go through if she switches realms during the cast.
Nasus' Spirit Fire will stay in the realm it was cast.
However, the spell will keep affecting enemies in another realm if they were already affected by it before switching realms and they have not left the spell's area.(bug)[31]
Nautilus' Depth Charge will not follow its target between realms.
Neeko's Inherent Glamour does not copy Mordekaiser's Realm of Death form.
Neeko's Pop Blossom will follow her between realms but only the leap VFX will be visible.
Nilah's Apotheosis will only deal damage to enemies in the realm it was cast.(unexpected)
It will still heal/shield targets in Nilah's realm at the end of the cast.
Nocturne's Paranoia only applies nearsight to enemy champions in the same realm as him.
Orianna's Ball will go back to her after switching realms.
Orianna's Command: Shockwave will follow her between realms if her ball is not on the ground.
However, if her ball is on the ground, Command: Shockwave will still follow her between realms but its shockwave will be invisible.(bug)[32]
Poppy's Keeper's Verdict can send Mordekaiser outside of the Death Realm arena if she uses it during Realm of Death's cast.(bug)[33]
Pyke's Phantom Undertow will not follow him if he switches realms while the Phantom is coming back.
Rakan's Grand Entrance will follow him between realms, but its initial VFX will not.(bug)[34]
Rek'Sai's Tunnels will not follow her between realms.
If Rek'Sai is already on a tunnel when switching realms, her dash will not be interrupted.
Sion's Decimating Smash VFX will follow him between realms, but the spell will only affect enemies in the realm it was cast.(bug)[35]
Soraka's Wish will heal targets in all realms.
Swain's Nevermove can still be recast if the target is in another realm, but nothing will happen.(unexpected)
Sylas' Abduct will not hit enemies if he switches realms during the spell's animation.
Syndra's Force of Will will cancel on realm switch.
Syndra's Unleashed Power will only affect enemies in the realm it was cast, even if its target is Mordekaiser.
Tahm Kench's Devour target will get spit on realm switch. The target will still be dealt damage by the spit if applicable.
Taliyah's Weaver's Wall will get interrupted on realm switch.
Talon's Shadow Assault will follow him between realms but the blades will be invisible. The blades will become visible again on recast.
Taric's Bastion link will be temporarily disabled while in the Death Realm. The link will not break.
Thresh's Dark Passage will go back to him on realm switch.
Thresh's The Box pillars will be visible in all realms, but it will only affect enemies in the realm it was cast.(bug)[36]
Udyr's Wingborne Storm will stay in the realm it was cast.
If the storm's target is sent to a different realm than Udyr, the storm will start following him instead.
The storm's tracking VFX will stay in its target until the end of the spell.(bug)
Urgot's Fear Beyond Death cannot be recast if the target is not in the same realm as him.
If the target is being reeled in however, the execution at the end of the channel will take place regardless of the realm either he or the target is in.
Veigar's Event Horizon will spawn in Veigar's realm at the end of the cast.
Viego's Harrowed Path will follow him between realms.(bug)
The ground mist will be visible in all realms.(bug)
Viktor's Arcane Storm can be redirected with its recast even if Viktor is in a different realm from the singularity.
Xayah's Bladecaller cannot call Feathers between realms.
Yasuo's Last Breath will be interrupted if its target switches realms, unless the target is Mordekaiser.
Yone's Soul Unbound cannot be recast inside of the Death Realm.
Yorick's Maiden will not die with him if he dies inside of the Death Realm.(bug)[37]
Eulogy of the Isles will still go on cooldown and Yorick will be able to summon another Maiden once the cooldown ends.
If Yorick has more than one Maiden and one of them dies, Eulogy of the Isles will go on cooldown, even though there is still a Maiden in the map.
Zaahen's Dreaded Return will only pull affected enemies in the same realm it was cast.
Cryptbloom's nova will spawn at the user's realm and will only affect targets in said realm.
Elixir of Iron's trail will follow between realms, but it will be invisible.(bug)[38]
Iceborn Gauntlet's frost field will follow between realms, but it will be invisible.(bug)[39]
Redemption's beam will only affect targets in the realm it was cast, but its SFX will be heard in all realms.(bug)[40]
Dark Harvest's souls VFX will not follow between realms, but they will still be reaped succesfully.(bug)[41]
Glacial Augment's glacial rays will follow between realms, but they will be invisible.(bug)[42]
Death, unless protected by Resurrection

Tips & tricks (1)

While in lane, Realm of Death is best used while the target is between you and your turret. This is so the target doesn't have much space to go towards their turret, since the area of the Death Realm is created in front of Mordekaiser, leaving little space to move behind him.

Map-specific differences (12)

When certain Events begin, both Mordekaiser and his target are immediately forced out of the Death Realm, ending the ability prematurely.
If Mordekaiser kills his target, he will keep any stolen stats for the remainder of the round.
If Mordekaiser is in the Death Realm with the target dummy on the shop platform map when the combat phase ensues, he is immediately forced out of the Death Realm, ending the ability prematurely.
The Ring of Fire is special-cased to not apply its effects against units inside the Death Realm.
In the Reckoner Arena battlefield, the pillars will stay visible and will behave as normal inside of Death Realm, with the exception of them being untargetable.
Akali's shroud will follow her between realms.(bug)
This bug was fixed on patch V14.1, but it is still present in Arena.
If someone who enters the Death Realm has the augment Chauffeur, their hitbox will follow their ally, while they appear to stand still at the position where they entered the Death Realm.(bug)
Only when they cast an ability, will they visually teleport to their real position. Once the cast of that ability is over, they will visually teleport back to their original position.
If the ally of someone who enters the Death Realm has the augment Chauffeur, this ally will follow them into the Death Realm.
This ally will only follow the main target out of the Death Realm if they are currently attached or once they reattach.
That means that if they have a way to permanently deattach from their ally, they can permanently stay in the Death Realm.(bug)

Stats and abilities from the League of Legends Wiki (CC BY-SA 3.0), built for patch 26.22.

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Where it thrives (5-comp fit)

Catchnatural · 60%

Splitnatural · 60%

Attackworkable · 40%

Mordekaiser follows up fast when the enemy missteps. Enough Split and Attack sits in the kit to threaten a side lane once the map opens. W Indestructible banks a shield from damage dealt and taken (capped at 30% max HP) and can be recast to convert it into a heal instead.

Kit quirks

W Indestructible banks a shield from damage dealt and taken (capped at 30% max HP) and can be recast to convert it into a heal instead

R Realm of Death banishes a single enemy champion into an isolated 1v1 arena for 7s, stealing a percentage of their stats and healing Mordekaiser off their max HP

Passive Darkness Rise adds on-hit magic damage and stacks into a periodic max-HP-scaling damage aura, rewarding sustained auto-attacking in extended fights

Champion reference

Base stats and every ability with its per-rank values and ratios. Search all champions →

Mordekaiser (Sahn-Uzal) — The Iron Revenant

Class: Juggernaut
Resource: Shield
Range type: Melee
Adaptive type: Magic
Positions: Top
Released: 2010-02-24 (V1.0.0.75)
Last changed: V26.20
Price: 675 BE · 585 RP

Damage

Toughness

Control

Mobility

Utility

Difficulty

Base stats

Stat	Base	Per level	Level 18
Health	645	+104	2413
Health regen (per 5s)	5	+0.75	17.75
Armor	37	+4.2	108.4
Magic resist	32	+2.05	66.85
Attack damage	61	+4	129
Attack speed	0.625	+1%	0.731
Attack speed ratio	0.625
Attack range	175
Movement speed	335

Level 18 uses League's growth curve (base + 17 × per-level); attack speed grows as bonus % scaled by the attack speed ratio.

Advanced stats & game-mode balance

Acquisition radius: 400
Selection height: 190
Selection radius: 125
Pathing radius: 35
Gameplay radius: 80
Attack cast time (s): 0.5
Attack total time (s): 2.366
Attack delay offset: -0.1

ARAM: damage dealt ×1 · damage taken ×1

One for All: damage dealt ×0.95 · damage taken ×1.05

URF: damage taken ×0.85

Ultimate Spellbook: damage taken ×1.05

Abilities

Passive

Darkness Rise

Effect radius: 375

Innate: Mordekaiser's basic attacks are empowered to deal 40% AP bonus magic damage on-hit.

Targeting input: PassiveAffects: Self / EnemiesDamage type: See NotesDamage sub-types: MagicSpell shield: Not BlockedParries: Blocked

Damage details (2)

Darkness Rise: On Hit — Magic damage
Tags: Proc damage
Properties: ApplyDamageModifier, ApplyLifesteal, ApplyOmnivamp, EnableCallForHelp, EnableKill, RespectDodge, RespectImmunity, TriggerDamageEvents, TriggerOnHitEvents
Darkness Rise: Aura — Magic damage
Tags: Ability damage, Area damage, Periodic damage
Properties: ApplyDamageModifier, ApplyLifesteal, ApplyOmnivamp, EnableCallForHelp, EnableKill, RespectDodge, RespectImmunity, TriggerDamageEvents, TriggerOnHitEvents

Notes (11)

Darkness Rise deals persistent area damage damage around Mordekaiser, while the bonus damage on his basic attacks is proc damage.
Darkness Rise's bonus damage on-hit is not applied against structures.
Mordekaiser has a stack counter under his health bar that is not visible to other champions. It will light up when the maximum effect is active.
Mordekaiser will still generate Darkness Rise stacks from hitting his abilities even if they deal no damage, such as if the target is invulnerable or blocks an ability with a spell shield.
Basic attacks do not generate a stack if their damage event does not happen due to the target being invulnerable, or the attack being dodged, blocked, or missed while Mordekaiser is blinded.
Dusk and Dawn's Spellblade on-hit event is special cased to generate an additional Darkness Rise stack.
The on-hit event is not triggered if the triggering attack is dodged, blocked, or missed while Mordekaiser is blinded, thus not generating a Darkness Rise stack. It is still triggered against invulnerable targets, generating a Darkness Rise stack.
Darkness Rise's area damage alone does not refresh Darkness Rise's buff.
If Darkness Rise is activated through either Obliterate or Death's Grasp, it will be treated as the same cast instance as the triggering spell.(bug)
Under these conditions, Darkness Rise will fail to interact with effects that only do so once per cast instance (e.g Conqueror), but will interact with effects such as Spear of Shojin's Focused Will's stacking, which would normally not interact with innate abilities.[1]
Darkness Rise's damage will be grouped with the triggering spell's damage in the death recap.[2]

Obliterate

Cooldown: 8 / 7 / 6 / 5 / 4Cast time: 0.5Range: 22.5 - 625Width: 90 - 150Queue threshold: 0.275

Active: Mordekaiser strikes his mace down in a line in the target direction, dealing magic damage to enemies within, increased if only one enemy is hit.

Magic Damage: 0 – 77 (based on level) (+ 80 / 115 / 150 / 185 / 220) (+ 120% bonus AD) (+ 70% AP)
Isolated Damage Increase: 30 / 35 / 40 / 45 / 50%

Targeting input: DirectionAffects: EnemiesDamage type: See NotesDamage sub-types: MagicSpell shield: BlockedProjectile: Not Blocked

Damage details (2)

Obliterate: Multi-Hit — Magic damage
Tags: Ability damage, Area damage
Properties: ApplyDamageModifier, ApplyLifesteal, ApplyOmnivamp, EnableCallForHelp, EnableKill, RespectDodge, RespectImmunity, TriggerDamageEvents, TriggerOnHitEvents
Obliterate: Isolated Hit — Magic damage
Tags: Ability damage
Properties: ApplyDamageModifier, ApplyLifesteal, ApplyOmnivamp, EnableCallForHelp, EnableKill, RespectDodge, RespectImmunity, TriggerDamageEvents, TriggerOnHitEvents

Notes (11)

This ability always employs Quick cast.
This ability will cast from wherever the caster is at the end of the cast time.
The ability will cast to wherever the caster's cursor was at the start of the cast time.
If Mordekaiser's location changes during the cast time, the visual effects of Obliterate will be divided into three sections: one forming toward the caster's cursor at the start of the cast, one forming toward the original cast direction, and one following Mordekaiser's facing direction. Only the first will portray the spell's effect accurately.(bug)[3]
Applies spell damage if it hits one target and area damage to multiple targets.
Obliterate's damage against isolated enemies at:
Rank 1: 104 – 204.1 (based on level) (+ 156% bonus AD) (+ 91% AP)
Rank 2: 155.25 – 259.2 (based on level) (+ 162% bonus AD) (+ 94.5% AP)
Rank 3: 210 – 317.8 (based on level) (+ 168% bonus AD) (+ 98% AP)
Rank 4: 268.25 – 379.9 (based on level) (+ 174% bonus AD) (+ 101.5% AP)
Rank 5: 330 – 445.5 (based on level) (+ 180% bonus AD) (+ 105% AP)

Indestructible

Cooldown: 12 / 11 / 10 / 9 / 8Cast time: noneQueue threshold: 0.25

Recast: Mordekaiser consumes the remaining shield, healing for a portion of the amount.

Shield to Healing: 35 / 37.5 / 40 / 42.5 / 45%

Targeting input: AutoAffects: Self

Notes (3)

Both casts count as ability activations for the purposes of on-cast effects such as Spellblade and triggering Force Pulse's passive.
The recast will heal Mordekaiser for a minimum of 1.75 / 1.875 / 2 / 2.125 / 2.25% and up to 10.5 / 11.25 / 12 / 12.75 / 13.5% of his maximum health.
It also effectively converts 15.75 / 16.875 / 18 / 19.125 / 20.25% of damage dealt and 2.625 / 2.8125 / 3 / 3.1875 / 3.375% of damage taken, reduced to 3.9375 / 4.2188 / 4.5 / 4.7813 / 5.0625% and 0.6563 / 0.7031 / 0.75 / 0.7969 / 0.8438% for non-champion sources respectively.

Indestructible

Cooldown: 12 / 11 / 10 / 9 / 8Cast time: noneQueue threshold: 0.25

Recast: Mordekaiser consumes the remaining shield, healing for a portion of the amount.

Shield to Healing: 35 / 37.5 / 40 / 42.5 / 45%

Targeting input: AutoAffects: Self

Notes (3)

Both casts count as ability activations for the purposes of on-cast effects such as Spellblade and triggering Force Pulse's passive.
The recast will heal Mordekaiser for a minimum of 1.75 / 1.875 / 2 / 2.125 / 2.25% and up to 10.5 / 11.25 / 12 / 12.75 / 13.5% of his maximum health.
It also effectively converts 15.75 / 16.875 / 18 / 19.125 / 20.25% of damage dealt and 2.625 / 2.8125 / 3 / 3.1875 / 3.375% of damage taken, reduced to 3.9375 / 4.2188 / 4.5 / 4.7813 / 5.0625% and 0.6563 / 0.7031 / 0.75 / 0.7969 / 0.8438% for non-champion sources respectively.

Death's Grasp

Cooldown: 16 / 14 / 12 / 10 / 8Cast time: 0.25Target range: 700 • 900Effect radius: 800 • 200Width: 200Speed: 3000

Passive: Mordekaiser gains magic penetration.

Magic Penetration: 5 / 7.5 / 10 / 12.5 / 15%

Active: Mordekaiser summons a claw in the target direction that grants sight of the area. After 0.5 seconds, it deals magic damage to enemies within and pulls them over 250 units.

Magic Damage: 60 / 80 / 100 / 120 / 140 (+ 45% AP)

Damage details (1)

Death's Grasp: Claw — Magic damage
Tags: Ability damage, Area damage
Properties: ApplyDamageModifier, ApplyLifesteal, ApplyOmnivamp, EnableCallForHelp, EnableKill, RespectDodge, RespectImmunity, TriggerDamageEvents, TriggerOnHitEvents

Notes (3)

Death's Grasp will still pull even if Mordekaiser dies.
Death's Grasp will only be visible from the enemy team's perspective if it is at least 300 units into their sight.
This ability will cast from wherever the caster is at the start of the cast time.

Realm of Death

Cooldown: 120 / 110 / 100Cast time: 0.5Target range: 650Effect radius: 1200Queue threshold: 0.25

When the Realm of Death ends, all affected champions are returned to the normal realm. The Realm of Death ends prematurely if either affected champion dies or is forced out of the realm.

Targeting input: UnitTarget out-of-range override: Walk in range of the target unit to castAffects: EnemiesSpell shield: See Notes

Damage details (1)

Realm of Death: Health Reduction — True damage
Tags: Default damage
Properties: ApplyDamageModifier, ApplyLifesteal, ApplyOmnivamp, EnableCallForHelp, EnableKill, RespectDodge, RespectImmunity, TriggerDamageEvents, TriggerOnHitEvents

Notes (163)

The Death Realm is a battlefield that exists outside of the normal realm in an alternate "dimension". It exists only for Mordekaiser and his target. It consists of an arena that has a radius of 1200 units and includes any terrain features that would exist in the map of the normal realm, including walls and brushes.
Structures exist in all realms at the same time. Turrets will behave normally as if all units were in the same realm.
The boundaries of the arena are impassable but not considered terrain themselves ( Unstoppable Onslaught exception), and enemies that try to move out of the area will be displaced back inside.
Dashes, blinks, displacements and other forms of movement will cap their effect range to the boundary. Targets will stop at the boundary even after it expired.
During the cast time of Realm of Death, it is possible to pathfind outside the boundaries of the arena by issuing a movement command toward an area that becomes inaccessible due to terrain inside the Death Realm.(bug)[4]
Realm of Death retains Mordekaiser's previous current health percentage when granting him a portion of the target's maximum health.
Realm of Death's healing is affected by healing modifiers.
Realm of Death's target will be marked by Mordekaiser for assist credit when entering the Death Realm.
Realm of Death does not trigger in-combat effects.
Realm of Death will cancel and go on cooldown after its cast time if:
The target is displacement immune, crowd control immune or protected by a spell shield.
Note that all of the above are ineffective if they are applied after the target has been banished.
The target is a clone or Sion when his Glory in Death is active.
If the target becomes untargetable, dies, is too far away or Mordekaiser loses sight of them due to nearsight during the cast time, this ability will cancel but does not go on cooldown.
If either Mordekaiser or the target dies at the same time of the transition into the Death Realm, the Death Realm will not end prematurely and will continue until its full duration has ended.(bug)[5]
If the target dies this way, Mordekaiser will not keep their stats after leaving the Death Realm.
Tahm Kench's Devour will always trigger this bug if used during the cast of Realm of Death and the spit would kill Mordekaiser.[6]
If Mordekaiser or the target cast another Realm of Death, the affected champions will remain stuck for the duration of the new circle.
The previous circle will be overridden by the new one; it will be dispelled to enter the new circle.
Spell shield will not block the initial slow.
The reveal effect lasts for 1.25 seconds from the start of the cast time if the cast does not complete. Otherwise, the reveal ends as soon as the cast time completes.
Upon entering or leaving the Death Realm, targets revealed by effects such as Ignite or Ashe's Hawkshot will keep the reveal VFX but will stop being revealed.(bug)[7]
Camouflaged units will become visible if an enemy champion is within their detection range, even if the champion is in a different realm.(bug)
If the target's current health is lower than the amount that should be stolen, they will be brought down to 1 health. Mordekaiser will still get the intended amount of maximum health.
Realm of Death's maximum health reduction ignores invulnerability effects.
Entering or leaving the Death Realm will cause all targeted projectiles to be destroyed.
The transition in and out of the Death Realm doesn't interrupt channels.
Grand Starfall will always be interrupted by the transition into the realm.
Realm of Death will not be dispelled if either of the two affected champions enter resurrection after taking lethal damage. It is dispelled if the target enters a zombie state.
Any active tether effects (both friendly and hostile ones) existing on either of the two champions entering the realm will be broken (unless the tether is between those two).
Upon entering the realm, Mordekaiser and the target are cleansed from all forced action effects.
The cleanse will occur even if the source of the crowd control enters the realm.(unexpected)
Unlike the other stats, Mordekaiser does not steal enemy total size; instead he gains 10% of his own size and reduces the enemy's size by 10% of theirs (all size modifiers stack additively).
Mordekaiser grows in size over 0.25 seconds after successfully stealing his targets' stats, and shrinks over 0.25 seconds after the buff runs out again. The target shrinks over 0.25 seconds after their stats are stolen, but grows back to normal size instantly when the effect ends.
While Mordekaiser has hold of his enemy's stats, that champion's circular portrait will appear as a pip next to his health bar, visible to all players.
The champion's portrait will ocasionally stay even after Mordekaiser has lost hold of the enemy's stats.(bug)
Realm of Death's interactions with other elements/abilities (This list might be incomplete, last updated on patch V26.16):
Multiple Death Realms (possible through a hijacked Realm of Death or if multiple Mordekaisers are in the same match) spawned will exist in the same realm, allowing champions to see and interact with champions bound to other circles. Champions are only affected by their boundaries and are not able to see the others.
If another Realm of Death is cast while one is already active, upon leaving, the spirits from the second Realm of Death will be invisible from the perspective of the players affected by the first Realm of Death.(bug)[8]
Tahm Kench's Devour can carry a target outside of their circle, but they will be displaced back inside once Regurgitated.
An active Cease and Desist on a target outside the perimeter will cause Vi to continue her charge until her circle ends. She can knock back and damage secondary targets multiple times.
Champions inside the Death Realm continue gaining gold and experience from any source, which includes nearby and global bounties as well as neutral buffs.
Turret's Crystalline Overgrowth can still be triggered while inside the Death Realm.
The Overgrowth's VFX of the Outer Turrets (Tier 1) will be invisible inside the Death Realm.(bug)[9]
Wards placed in the Death Realm will not be destroyed at its end.
The ward limit for each champion will be separate for the Death Realm.
The faelights and jungle plants ( Blast Cone, Honeyfruit, Scryer's Bloom) will not be present in the Death Realm.
The faelights indicator will still be visible if the player's cursor is placed in their location.(bug)[10]
The Blast Cone's landing indicator will still be visible while in the Death Realm and within its range.(bug)[11]
Monsters, with the exception of Voidgrub's, will be visible for a brief moment after entering the Death Realm, but they will be untargetable.(bug)[12]
Hex-gates on Hextech Rift will not be present between realms.
Eye of the Herald and Teleport are disabled while in the Death Realm.
Using Unsealed Spellbook to obtain Teleport while in the Death Realm will enable the user to use it.(bug)
Using Unsealed Spellbook to swap Teleport for another summoner spell while in the Death Realm will disable the new summoner spell until the user leaves the realm.(bug)[13]
The Eye of the Herald can still spawn in the Death Realm if its automatically consumed while inside.(unexpected)
The Herald will die at the end of Realm of Death.
Controllable pets and clones can still be commanded between realms.
Mordekaiser will be given gold, if applicable, for pets killed at the end of Realm of Death.
Clones and Illaoi's Tentacles will not be killed at the end of Realm of Death.(unexpected)
Annie's Tibbers, Heimerdinger's H-28Q Apex Turret, Ivern's Daisy and Yorick's Maiden are considered as "large pets" for the purposes of this ability and will follow their respective champions between realms.
If Mordekaiser dies inside of the Death Realm while his Darkness Rise is hitting any of these pets, Darkness Rise will keep affecting the pets until they die or Darkness Rise deactivates normally.(bug)[14]
Switching realms detaches all attached champions on either of the two champions entering the realm.
The allied health, resource, and ultimate indicators (champion portraits located on the screen) will not update between realms as the players have no vision of them.
Pings used in the Death Realm will appear in the chat and mini-map, but will not appear in the map.(unexpected)
Any spawned terrain while in the Death Realm will remain inside until expired. They will not be destroyed.
Except for some cases, spells that require a target to be cast (e.g Akali's Shuriken Flip, Twitch's Contaminate) will not affect enemies in other realms nor will be castable if there's no targets in the same realm as the caster.
Amumu's Bandage Toss, Blitzcrank's Rocket Grab, Leona's Zenith Blade, Nautilus' Dredge Line, Pyke's Bone Skewer and Thresh's Death Sentence will still hit targets if their caster switches realms before they hit.
Camille's The Hextech Ultimatum, Dr. Mundo's Goes Where He Pleases, Nunu & Willump's Biggest Snowball Ever! and Absolute Zero, Pyke's Death from Below, Ryze's Realm Warp, Shen's Spirit's Refuge, Taliyah's Worked Ground and Zed's Shadows will follow their caster between realms.
Braum's Glacial Fissure[15], Pantheon's Grand Starfall*[16], Singed's Mega Adhesive[17], Varus' Hail of Arrows[18], Yasuo's Wind Wall[19], Ziggs' Satchel Charge*[20] and Zilean's Time Bomb*[21] will follow their caster between realms but will only be visible in the realm they were cast.(bug)
Ahri's Orb of Deception will stay in the realm it was cast.
The orb will still go back towards Ahri's position.
Akshan's Avengerang will stay in the realm it was cast.
The boomerang will only go back towards Akshan's position if it was already doing so during the realm switch.
Akshan's Comeuppance bullets will get destroyed if he switches realms, even if its target is Mordekaiser.
Anivia's Glacial Storm will not be dispelled if Anivia switches realms, but it will only be present in the realm it was cast.
Aatrox's Infernal Chains tether will be destroyed if his target switches realms.
Bel'Veth's Void Corals will only be present in the realm they spawned in.
If Bel'Veth switches realms while she is consuming a Void Coral, the Void Coral will dissappear and she will not get her True Form nor deal damage to nearby enemies.
Camille will still be able to use Hookshot's dash if she switches realms before the spell hits.
Ekko's Parallel Convergence will only be visible in the realm it was cast, but he will still be able to trigger the spell's effect from another realm and it will only affect enemies in said realm.(bug)[22]
Fizz's Chum the Waters will follow its target between realms.
Galio's Winds of War will follow him if the spell was already on the ground before the realm switch, but it will only be visible in the realm it was cast.(bug)[23]
Gnar's Boulder Toss boulder will only be visible in the realm it was cast, but he can still pick it up if he goes to its location.(bug)[24]
Illaoi's Test of Spirit tether will be destroyed if her target switches realms.
Test of Spirit's target will not be made into a Vessel.
Irelia's Flawless Duet will be recast automatically when switching realms, and will only affect enemies in the realm it was cast.
Ivern's Rootcaller can still be recast if the target is in a different realm than him.
Ivern's Brushmaker brushes might be visible for a few seconds after switching realms.(bug)[25]
Passing by the position of a brush created by Brushmaker in another realm will make units transparent for a few seconds, but they will still be visible to the enemy team.
Jarvan IV's Cataclysm deactivation VFX will appear in the realm he is at.
Kai'Sa's Killer Instinct can only be cast towards enemies in the same realm she is at.
Kalista's Fate's Call cannot be cast if her oathsworn is in another realm, but if the spell was cast before entering the Death Realm, it will function as normal and will only affect targets in the oathsworn's realm.
Karthus' Requiem will damage enemies in all realms.
Kayn's Umbral Trespass will be interrupted and will not deal damage if its target switches realms.
Kog'Maw's Void Ooze will follow him between realms.(bug)[26]
A part of the VFX will be left in the realm it was cast.
Lillia's Lilting Lullaby will only affect enemies in the same realm as her.
Lissandra's Glacial Path can still be recast if the spell was initially cast in another realm.
Lulu's Pix will follow her between realms.
However, if Pix is on another champion, it will visually stay in Lulu's realm but will keep affecting enemies in the Death Realm.(bug)[27]
Pix will still be able to return to Lulu as normal, even if her ally's still in the Death Realm.
If Locke's Purgatory's totem is in the ground, it will follow Locke between realms.(bug)
If the totem closes in a different realm than Locke, the totem will be visible in Locke's realm but it will only be pickable in the realm it closed.(bug)
Lux's Prismatic Barrier will grant her its second shield if she switches realms as the wand is coming back.
Lux's Final Spark will follow her between realms.
The beam's VFX will only be visible in the realm it was cast.(bug)[28]
Malzahar's Void Shift is special cased to not resist the slow but instead resist the realm switch after the cast completes.
Malzahar's Call of the Void will follow him if used moments before the realm switch. Also, a part of the VFX will be left in the realm it was cast.(bug)[29]
Mel's Golden Eclipse will only deal damage to enemies in the same realm she is at the end of the cast.
Miss Fortune's Make It Rain will follow her between realms.(bug)[30]
The spell's area VFX will not follow.(bug)
Naafiri's Hounds' Pursuit dash will still go through if she switches realms during the cast.
Nasus' Spirit Fire will stay in the realm it was cast.
However, the spell will keep affecting enemies in another realm if they were already affected by it before switching realms and they have not left the spell's area.(bug)[31]
Nautilus' Depth Charge will not follow its target between realms.
Neeko's Inherent Glamour does not copy Mordekaiser's Realm of Death form.
Neeko's Pop Blossom will follow her between realms but only the leap VFX will be visible.
Nilah's Apotheosis will only deal damage to enemies in the realm it was cast.(unexpected)
It will still heal/shield targets in Nilah's realm at the end of the cast.
Nocturne's Paranoia only applies nearsight to enemy champions in the same realm as him.
Orianna's Ball will go back to her after switching realms.
Orianna's Command: Shockwave will follow her between realms if her ball is not on the ground.
However, if her ball is on the ground, Command: Shockwave will still follow her between realms but its shockwave will be invisible.(bug)[32]
Poppy's Keeper's Verdict can send Mordekaiser outside of the Death Realm arena if she uses it during Realm of Death's cast.(bug)[33]
Pyke's Phantom Undertow will not follow him if he switches realms while the Phantom is coming back.
Rakan's Grand Entrance will follow him between realms, but its initial VFX will not.(bug)[34]
Rek'Sai's Tunnels will not follow her between realms.
If Rek'Sai is already on a tunnel when switching realms, her dash will not be interrupted.
Sion's Decimating Smash VFX will follow him between realms, but the spell will only affect enemies in the realm it was cast.(bug)[35]
Soraka's Wish will heal targets in all realms.
Swain's Nevermove can still be recast if the target is in another realm, but nothing will happen.(unexpected)
Sylas' Abduct will not hit enemies if he switches realms during the spell's animation.
Syndra's Force of Will will cancel on realm switch.
Syndra's Unleashed Power will only affect enemies in the realm it was cast, even if its target is Mordekaiser.
Tahm Kench's Devour target will get spit on realm switch. The target will still be dealt damage by the spit if applicable.
Taliyah's Weaver's Wall will get interrupted on realm switch.
Talon's Shadow Assault will follow him between realms but the blades will be invisible. The blades will become visible again on recast.
Taric's Bastion link will be temporarily disabled while in the Death Realm. The link will not break.
Thresh's Dark Passage will go back to him on realm switch.
Thresh's The Box pillars will be visible in all realms, but it will only affect enemies in the realm it was cast.(bug)[36]
Udyr's Wingborne Storm will stay in the realm it was cast.
If the storm's target is sent to a different realm than Udyr, the storm will start following him instead.
The storm's tracking VFX will stay in its target until the end of the spell.(bug)
Urgot's Fear Beyond Death cannot be recast if the target is not in the same realm as him.
If the target is being reeled in however, the execution at the end of the channel will take place regardless of the realm either he or the target is in.
Veigar's Event Horizon will spawn in Veigar's realm at the end of the cast.
Viego's Harrowed Path will follow him between realms.(bug)
The ground mist will be visible in all realms.(bug)
Viktor's Arcane Storm can be redirected with its recast even if Viktor is in a different realm from the singularity.
Xayah's Bladecaller cannot call Feathers between realms.
Yasuo's Last Breath will be interrupted if its target switches realms, unless the target is Mordekaiser.
Yone's Soul Unbound cannot be recast inside of the Death Realm.
Yorick's Maiden will not die with him if he dies inside of the Death Realm.(bug)[37]
Eulogy of the Isles will still go on cooldown and Yorick will be able to summon another Maiden once the cooldown ends.
If Yorick has more than one Maiden and one of them dies, Eulogy of the Isles will go on cooldown, even though there is still a Maiden in the map.
Zaahen's Dreaded Return will only pull affected enemies in the same realm it was cast.
Cryptbloom's nova will spawn at the user's realm and will only affect targets in said realm.
Elixir of Iron's trail will follow between realms, but it will be invisible.(bug)[38]
Iceborn Gauntlet's frost field will follow between realms, but it will be invisible.(bug)[39]
Redemption's beam will only affect targets in the realm it was cast, but its SFX will be heard in all realms.(bug)[40]
Dark Harvest's souls VFX will not follow between realms, but they will still be reaped succesfully.(bug)[41]
Glacial Augment's glacial rays will follow between realms, but they will be invisible.(bug)[42]
Death, unless protected by Resurrection

Tips & tricks (1)

While in lane, Realm of Death is best used while the target is between you and your turret. This is so the target doesn't have much space to go towards their turret, since the area of the Death Realm is created in front of Mordekaiser, leaving little space to move behind him.

Map-specific differences (12)

When certain Events begin, both Mordekaiser and his target are immediately forced out of the Death Realm, ending the ability prematurely.
If Mordekaiser kills his target, he will keep any stolen stats for the remainder of the round.
If Mordekaiser is in the Death Realm with the target dummy on the shop platform map when the combat phase ensues, he is immediately forced out of the Death Realm, ending the ability prematurely.
The Ring of Fire is special-cased to not apply its effects against units inside the Death Realm.
In the Reckoner Arena battlefield, the pillars will stay visible and will behave as normal inside of Death Realm, with the exception of them being untargetable.
Akali's shroud will follow her between realms.(bug)
This bug was fixed on patch V14.1, but it is still present in Arena.
If someone who enters the Death Realm has the augment Chauffeur, their hitbox will follow their ally, while they appear to stand still at the position where they entered the Death Realm.(bug)
Only when they cast an ability, will they visually teleport to their real position. Once the cast of that ability is over, they will visually teleport back to their original position.
If the ally of someone who enters the Death Realm has the augment Chauffeur, this ally will follow them into the Death Realm.
This ally will only follow the main target out of the Death Realm if they are currently attached or once they reattach.
That means that if they have a way to permanently deattach from their ally, they can permanently stay in the Death Realm.(bug)

Stats and abilities from the League of Legends Wiki (CC BY-SA 3.0), built for patch 26.22.