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| Passive | Icathian Surprise | | | | Upon dying, Kog'Maw starts a chain reaction in his body which causes him to move faster and detonate after 4 seconds; dealing 100 + (25 x lvl) true damage to surrounding enemies. |
| Q | Caustic Spittle | 975.0 | 60 / 60 / 60 / 60 / 60 Mana | 8 / 8 / 8 / 8 / 8 | Passive: Increases Attack Speed by 10/15/20/25/30%.
Active: Launches a corrosive projectile that deals 80/130/180/230/280 (+0.5) magic damage to the first enemy hit and reduces its Armor and Magic Resist by 20/22/24/26/28% for 4/4/4/4/4 seconds. |
| W | Bio-Arcane Barrage | | 0 / 0 / 0 / 0 / 0 | 17 / 17 / 17 / 17 / 17 | Basic attacks gain 130/150/170/190/210 range and deal additional magic damage equal to 2/3/4/5/6% (+0.01)% of the enemy's maximum Health (Max: 100 Damage vs Monsters). Lasts 8/8/8/8/8 seconds. |
| E | Void Ooze | 1200.0 | 80 / 90 / 100 / 110 / 120 Mana | 12 / 12 / 12 / 12 / 12 | Deals 60/110/160/210/260 (+0.7) magic damage to enemies it passes through and leaves a trail which slows enemies by 20/28/36/44/52% for 4/4/4/4/4 seconds. |
| R | Living Artillery | | 40 / 40 / 40 Mana | 2 / 1.5 / 1 | Fires a living artillery shot from a great distance that lands shortly after launch. Deals 80/120/160 (+) (+0.3) magic damage and reveals non-stealthed enemies for 4 seconds (deals 125/125/125% bonus base damage to Champions).
Subsequent artillery shots within 6/6/6 seconds cost 40 additional Mana up to a maximum of 400/400/400 Mana. |