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Previous Lore

"If that's just hungry, I don't want to see angry." - TryndamereSquare Tryndamere

When the prophet MalzaharSquare Malzahar was reborn in Icathia, he was led there by an ominous voice which thereafter anchored itself to his psyche. From within, this voice bestowed upon him terrible purpose, and though Malzahar was no longer tormented by its call, the voice did not cease its unrelenting summons. This baleful beacon's gentle flicker - now fastened to Runeterra - drew forth a putrid beast that ambled across a threshold it did not understand, widening a fissure between the spaces which were never meant to meet. There amongst the haunting ruins of Icathia, Kog'MawSquare Kog'Maw manifested in Valoran with unsettling curiosity. The spark which led him to Runeterra teased him still, urging him gently towards Malzahar. It also encouraged him to familiarize himself with his new environment, to the stark horror of everything he encountered on his journey.

The enchanting colors and aromas of Runeterra intoxicated Kog'Maw, and he explored the fruits of the strange world the only way he knew how: by devouring them. At first he sampled only the wild flora and fauna he happened across. As he traversed the parched Tempest Flats, however, he came upon a tribe of nomads. Seemingly unhampered by conventional rules of physics, Kog'Maw consumed every nomad and any obstacles they put in his way, amounting to many times his own mass and volume. The most composed of his victims may have had time to wonder if this was due to the Caustic Spittle caustic enzymes which stung the ground as they dripped from his gaping mouth, although such musings were abruptly concluded. Even this feeding frenzy did nothing to satiate Kog'Maw's appetite. His swathe of destruction continues still as he is inexorably drawn towards Malzahar. What happens when he finds him is anyone's guess.

"If that's just hungry, I don't want to see angry." - TryndamereSquare Tryndamere, the Barbarian King

When the prophet MalzaharSquare Malzahar was reborn in Icathia, he was led there by an ominous voice which thereafter anchored itself to his psyche. From within, this voice bestowed upon him terrible purpose, and though Malzahar was no longer tormented by its call, the voice did not cease its unrelenting summons. This baleful beacon's gentle flicker - now fastened to Runeterra - drew forth a putrid beast that ambled across a threshold it did not understand, widening a fissure between spaces which were never meant to meet. There, amongst the haunting ruins of Icathia, Kog'MawSquare Kog'Maw manifested in Valoran with unsettling curiosity. The spark which led him to Runeterra teased him still, urging him gently towards Malzahar. It also encouraged him to familiarize himself with his new environment, to the stark horror of everything he encountered on his journey.

The enchanting colors and aromas of Runeterra intoxicated Kog'Maw, and he explored the fruits of the strange world the only way he knew how: by devouring them. At first he sampled only the wild flora and fauna he happened across. As he traversed the parched Tempest Flats, however, he came upon a tribe of nomads. Seemingly unhampered by conventional rules of physics, Kog'Maw consumed every nomad and any obstacles they put in his way, amounting to many times his own mass and volume. The most composed of his victims may have had time to wonder if this was due to the Caustic Spittle caustic enzymes which stung the ground as they dripped from his gaping mouth, although such musings were abruptly concluded. When his wake of catastrophe reached the Institute of War, an enthusiastic Malzahar greeted him with an enticing prospect: taste the best Runeterra could offer... on the Fields of Justice.

Previous Abilities

Icathian Surprise
Icathian Surprise old

Upon taking fatal damage, Kog'Maw remains active for 4 seconds, losing the ability to use abilities and basic attacks but becoming untargetable and invulnerable, as well as gaining up to 40% bonus movement speed over the duration. He then explodes, dealing 125 - 550 (based on level) true damage to all nearby enemies.

Ability Details
Icathian Surprise is a point-blank area of effect.

Additional Information:

  • Kog'Maw's respawn timer begins when he is killed (in Dominion it starts after Icathian Surprise ends)
  • Kog'Maw is cleansed of all debuffs upon triggering Icathian Surprise.
  • Guardian Angel item Guardian Angel and Chronoshift Chronoshift will take precedence over Icathian Surprise.
  • Children of the Grave Children of the Grave and Omen of Death Omen of Death will not resurrect Kog'Maw until after Icathian Surprise ends.


Caustic Spittle
RANGE: 1000
COST: 60 Mana
COOLDOWN: 8
Caustic Spittle old

Passive: Kog'Maw permanently has bonus attack speed.

  • Bonus Attack Speed: 10 / 15 / 20 / 25 / 30%

Active: Kog'Maw launches a corrosive projectile in the target direction, dealing magic damage to the first enemy it hits as well as reducing their armor and magic resistance for 4 seconds.

  • Magic Damage: 80 / 130 / 180 / 230 / 280 (+ 50% AP)
  • Resistances Reduction: 12 / 16 / 20 / 24 / 28%
Ability Details


Bio-Arcane Barrage
RANGE: 「 130 / 150 / 170 / 190 / 210 」「 630 / 650 / 670 / 690 / 710 」
COOLDOWN: 17
Bio-Arcane Barrage old

Active: For 8 seconds, Kog'Maw's basic attacks gain bonus range and deal bonus magic damage (capped at 100 against minions and monsters)

  • Bonus Magic Damage: 2 / 3 / 4 / 5 / 6% (+ 1% per 100 AP) of target's maximum health
Ability Details
Bio-Arcane Barrage is a self-targeted buff.


Void Ooze
RANGE: 1280
SPEED: 1350
COST: 80 / 90 / 100 / 110 / 120 Mana
COOLDOWN: 12
Void Ooze old

Active: Kog'Maw spews a ball of ooze in the target direction, dealing magic damage and Slow icon slowing enemies for 1 second. The ooze lingers for 4 seconds, Slow icon slowing enemies who stand in it as well as for 0.25 seconds after they leave the affected area.

  • Magic Damage: 60 / 110 / 160 / 210 / 260 (+ 70% AP)
  • Slow: 20 / 28 / 36 / 44 / 52%
Ability Details
Void Ooze is a direction-targeted area of effect.


Living Artillery
RANGE: 1200 / 1500 / 1800 / 100
COST: 40 - 400 (based on casts) Mana
COOLDOWN: 2 / 1.5 / 1
Living Artillery old

Active: Kog'Maw launches a ball of acid into the air that drops after 0.6 seconds at the target location, damaging all enemies hit and granting Sight icon sight of them for 4 seconds. Champions hit by Living Artillery take double its base damage.

「 Magic Damage: 80 / 120 / 160 」「 Magic Damage to Champions: 160 / 240 / 320 」 (+ 30% AP) (+ 50% bonus AD)

Each subsequent Living Artillery cast within the next 6 seconds costs an additional 40 mana (capping at 400 mana per cast)

Ability Details
Living Artillery is a ground-targeted area of effect.

Additional Information:

  • Living Artillery grants Sight icon sight in a small radius around the target area on-cast.
  • Living Artillery does not reveal but can still damage stealthed champions.


Previous Splash Art



Patch History

V7.23
  • Living Artillery Living Artillery
    • Bug Fix: Warning indicator VFX can once again be seen from self/ally view in Medium, Low, and Very Low graphics settings.
V7.22
  • Stats
    • Base attack damage increased to 65 from 57.46.
    • Base armor increased to 29 from 19.88.
V7.14
  • Kog'MawSquare Reindeer Kog'Maw [S|L]
    • Bug Fix: Vintage loading screen border now properly displays for original owners of the skin.
V7.9
  • Stats
    • Magic resistance growth increased to 0.5 from 0.
V6.24
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Maximum health bonus damage increased to 3 / 4 / 5 / 6 / 7% from 2 / 3 / 4 / 5 / 6%.
  • Void Ooze Void Ooze
    • Base damage reduced to 60 / 105 / 150 / 195 / 240 from 60 / 110 / 160 / 210 / 260.
    • AP ratio reduced to 50% AP from 70% AP.
V6.21
  • Living Artillery Living Artillery
    • Initial and stacking mana cost reduced to 40 from 50.
      • Maximum mana cost reduced to 400 from 500.
    • Increased cost debuff duration reduced to 8 seconds from 10.
    • Base damage increased to 100 / 140 / 180 from 70 / 110 / 150.
    • New Effect: Deals 0.83% increased damage for every 1% of target's missing health, up to 50% bonus damage (versus targets above 40% of their maximum health).
      • Maximum damage implemented at 150 / 210 / 270 + 97.5% bonus AD + 37.5% AP.
    • Threshold to deal double damage reduced to below 40% health from below 50% health. Target's below the above threshold take double damage instead of the previous modifier.
      • Base double damage increased to 200 / 280 / 360 from 140 / 220 / 300.
    • Removed: Triple damage below 25% health, previously 240 / 330 / 540 (+ 195% bonus AD) (+ 75% AP).
V6.20
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Made Bio-Arcane Barrage's attack animation cool again.
    • Updated Lion Dance Kog'Maw's hit particles for even more fireworks.
    • Updated Bio-Arcane Barrage's visual effects across skins to match the new duration.
V6.19
  • Stats
    • Base attack speed increased to 0.665 from 0.625.
    • Attack speed growth reduced to 2.65% from 3.5%.
  • Caustic Spittle Caustic Spittle
    • New Passive: 15 / 20 / 25 / 30 / 35% bonus attack speed.
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Removed: Bonus attack speed, maximum attack speed and reduced cast time.
    • Removed: Basic attacks dealing 55% AD to non-minions.
    • Removed: Base bonus magic damage reduced to 0 from 4 / 8 / 12 / 16 / 20.
    • Target's maximum health ratio increased to 2 / 3 / 4 / 5 / 6% of target's maximum health from 2% of target's maximum health at all ranks.
    • Target's maximum health AP ratio increased to 1% per 100 AP from 0.75% per 100 AP.
    • Bonus range increased to 130 / 150 / 170 / 190 / 210 from 90 / 120 / 150 / 180 / 210.
    • Cooldown increased to 17 seconds at all ranks from 13 / 11.5 / 10 / 8.5 / 7.
    • Duration increased to 8 seconds from 6.
    • New effect: Cooldown now starts on-cast instead of at the end of buff duration.
V6.8
  • Caustic Spittle Caustic Spittle
    • Resistance reduction increased to 20 / 22 / 24 / 26 / 28% from 12 / 16 / 20 / 24 / 28%.
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Base damage reduced to 4 / 8 / 12 / 16 / 20 from 10 / 15 / 20 / 25 / 30.
March 11th Hotfix
  • Bug Fix: On-hit effects were dealing significantly reduced damage while Bio-Arcane Barrage was active.
V6.5
  • Stats
    • Attack speed growth increased to 3.5% from 1.5%.
  • Caustic Spittle Caustic Spittle
    • Mana cost reduced to 40 from 60.
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Removed: Passive bonus attack speed.
    • Removed: Minimum damage threshold.
    • New Effect: Bonus damage has a base value of 5 / 10 / 15 / 20 / 25. Percentage health component unchanged.
V6.4
  • Stats
    • Base attack speed reduced to 0.625 from 0.665.
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Bonus damage cap against non-champions reduced to 60 from 100.
V6.3
  • Caustic Spittle Caustic Spittle
    • Moved: Passive 15 / 20 / 25 / 30 / 35% bonus attack speed.
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • New Effect: Passively grants 15 / 20 / 25 / 30 / 35% attack speed.
    • New Effect: The base magic damage has a minimum damage threshold of 15.
V5.24
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Base damage changed to 2% of target's maximum health from 1.25% per 100 AD (AP ratio unchanged).
November 17th Hotfix
  • Stats
    • Attack damage increased to 57.46 from 54.46.
    • Attack speed increased to 0.655 from 0.625.
V5.22
  • General
    • New ability icons.
    • Recommended items updated.
  • Stats
    • Base attack damage increased to 54.46 from 52.04.
    • Attack damage growth reduced to 2.41 from 3.
    • Base health reduced to 517.76 from 546.16.
    • Health growth reduced to 82 from 87.
  • Caustic Spittle Caustic Spittle
    • Passive's attack speed increased to 15 / 20 / 25 / 30 / 35% from 10 / 15 / 20 / 25 / 30%.
    • Range increased to 1175 from 975.
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Revised Active: For the next 6 seconds, Kog'Maw gains increased attack range, his total attack speed and attack speed cap are doubled and the cast times on his abilities are halved. For the duration, Kog'Maw's attacks versus non-minions deal only 55% of his attack damage but deal bonus magic damage equal to 「 1.25% per 100 AD 」「 1% per 80 AD 」 (+ 「 0.75% per 100 AP) 」「 1% per 133.3 AP 」 of the target's maximum health.
    • Duration reduced to 6 seconds from 8.
    • Bonus range reduced to 90 / 120 / 150 / 180 / 210 from 130 / 150 / 170 / 190 / 210.
    • Cooldown reduced to 13 / 11.5 / 10 / 8.5 / 7 seconds from 17 at all ranks.
    • New Effect: Cooldown timer begins when the buff ends instead of on-cast.
    • Mana cost increased to 40 from 0.
  • Living Artillery Living Artillery
    • Base damage reduced to 70 / 110 / 150 from 80 / 120 / 160.
    • Bonus AD ratio increased to 65% bonus AD from 50% Bonus AD
    • AP ratio reduced to 25% AP from 30% AP.
    • Removed: Bonus damage against champions.
    • New Effect: Deals 「 twice the damage 」「 140 / 220 / 300 + 130% Bonus AD + 50% AP 」 to targets below 50% health and 「 thrice the damage 」「 210 / 330 / 450 + 195% bonus AD + 75% AP 」 to targets below 25% health.
    • Base and per-stack mana cost increased to 50 from 40.
    • Maximum cost increased to 500 from 400.
    • Added cost duration increased to 10 seconds from 6.
V4.18
  • General
    • Classic artwork updated.
V4.14
  • Stats
    • Base movement speed reduced to 325 from 330.
  • Void Ooze Void Ooze
    • New particle effects.
  • Living Artillery Living Artillery
    • Bonus base magic damage to champions reduced to 100% from 125%.
V4.13
  • Stats
    • Base health reduced to 400 from 440.
    • Health per level increased to 87 from 84.
  • Caustic Spittle Caustic Spittle
    • Resistance reductions reduced to 12 / 16 / 20 / 24 / 28% from 20 / 22 / 24 / 26 / 28%.
V4.5
  • Stats
    • Base armor increased to 14 from 10.
V4.4
  • Caustic Spittle Caustic Spittle
    • Targeting changed to a linear skill shot from a targeted ability.
    • Range increased to 1000 from 625.
    • Base damage increased to 80 / 130 / 180 / 230 / 280 from 60 / 110 / 160 / 210 / 260
    • AP ratio reduced to 50% AP from 70% AP.
    • Shred increased to 20 / 22 / 24 / 26 / 28% from 5 / 10 / 15 / 20 / 25 flat.
    • Mana cost increased to 60 from 50.
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Mana cost reduced to 0 from 50.
V3.8
  • Void Ooze Void Ooze
    • Bug Fix: Fixed a bug where the slow wasn't reduced by Tenacity / Boots of Swiftness item Slow Resist.
    • New Effect: Missile now applies a 1 second slow to targets struck, refreshing every .25 seconds.
V1.0.0.152
  • Stats
    • Movement speed increased to 330 from 305.
V1.0.0.142
  • General
    • Updated tooltips.
  • Living Artillery Living Artillery
    • Maximum stack count increased to 10 from 5.
      • Max mana cost increased to 400 from 200.
V1.0.0.140b
V1.0.0.139
  • Void Ooze Void Ooze
    • Slow reduced to 20 / 28 / 36 / 44 / 52% from 28 / 36 / 44 / 52 / 60%.
V1.0.0.138
V1.0.0.131
V1.0.0.130
  • Icathian Surprise Icathian Surprise
    • Bug Fix: Enemies killed by the explosion were being awarded an extra kill.
    • Bug Fix: BrandSquare Brand being awarded an extra kill if triggered as Pyroclasm Pyroclasm traveled toward Kog'Maw.
    • Bug Fix: Not triggering if Kog'Maw is killed by Ignite Ignite.
    • Bug Fix: Not triggering if Kog'Maw was affected by Silver Bolts Silver Bolts.
V1.0.0.129
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Bonus attack range reduced to 130 / 150 / 170 / 190 / 210 from 130 / 160 / 190 / 220 / 250.
V1.0.0.127
V1.0.0.125
  • Icathian Surprise Icathian Surprise
    • Bug Fix: Now properly displays numbers in its tooltip as it updates with level.
V1.0.0.123
V1.0.0.121
  • General
    • Basic attack animation updated to be more responsive.
  • Caustic Spittle Caustic Spittle
    • Animation updated to be more responsive.
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Animation updated to be more responsive
    • Duration increased to 10 seconds from 6.
    • Cooldown increased to 17 seconds from 15.
  • Void Ooze Void Ooze
    • Bug Fix: Now properly flagged as an area-of-effect spell.
  • Living Artillery Living Artillery
    • Projectile drop time reduced slightly to improve consistency.
V1.0.0.118b
V1.0.0.118
  • Void Ooze Void Ooze
    • Bug Fix: Fixed a bug that was causing the line missile targeting display to be offset on Kog'MawSquare Kog'Maw's Void Ooze Void Ooze
V1.0.0.115
  • Void Ooze Void Ooze
    • Bug Fix: Fixed a bug where Void Ooze Void Ooze were treated as individual units and could break things like Noxious Trap mushrooms, block skillshots, etc.
V1.0.0.111
V1.0.0.106
  • Stats
    • Base movement speed reduced to 305 from 310.
V1.0.0.105
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Bug Fix: Fixed a bug where it was doing more damage than intended.
    • Bug Fix: Fixed a bug where it was dealing physical damage instead of magic damage.
V1.0.0.103
V1.0.0.102
V1.0.0.101
  • Caustic Spittle Caustic Spittle
    • Bug Fix: Giving multiplicative attack speed instead of the intended base one.
V1.0.0.100
  • Living Artillery Living Artillery
    • Self-buff text updated to display correct per-cast added cost (40).
V1.0.0.99
  • General
    • Abilities remade and shuffled around.
  • Caustic Spittle Caustic Spittle (Q)
    • Removed Passive: 13 / 16 / 19 / 22 / 26% armor penetration.
    • New Passive: Passively grants 10 / 15 / 20 / 25 / 30% bonus attack speed
    • Removed Active: Doubles passive armor penetration for 4 seconds.
    • New Active: Kog'Maw fires a projectile that reduces the target's armor by 5 / 10 / 15 / 20 / 25 for 4 seconds.
  • Bio-Arcane Barrage Bio-Arcane Barrage (W)
    • Cooldown reduced to 15 seconds from 20.
  • Void Ooze Void Ooze (E)
    • Cooldown reduced to 12 secods from 13.
V1.0.0.97
  • Stats
    • Base attack range increased to 500 from 450.
  • Caustic Spittle Caustic Spittle
    • Range increased to 625 from 600.
  • Bio-Arcane Barrage Bio-Arcane Barrage
    • Bonus range reduced to 130 / 160 / 190 / 220 / 250 from 140 / 180 / 220 / 260 / 300.
V1.0.0.96
V1.0.0.94
  • Icathian Surprise Icathian Surprise (Innate)
    • Upon dying, Kog'Maw starts a chain reaction in his body which causes him to detonate after 4 seconds; dealing magic damage to surrounding enemies.
  • Bio-Arcane Barrage Bio-Arcane Barrage (Q)
    • Kog'Maw's attacks gain range and deal a percent of the target's maximum health as magic damage.
  • Void Ooze Void Ooze (W)
    • Kog'Maw launches a peculiar ooze which damages all enemies it passes through and leaves a trail which slows enemies who stand on it.
  • Caustic Spittle Caustic Spittle (E)
    • Passive: Increases armor penetration.
    • Active: Kog'Maw launches a corrosive projectile which deals magic damage and doubles his passive armor penetration for 4 seconds (Removes the passive until available again).
  • Living Artillery Living Artillery (Ultimate)
    • Kog'Maw fires a living artillery shell at a great distance dealing damage and revealing targets. Additionally, multiple Living Artilleries in a short period of time cause them to cost additional mana.

References