Upon dying, Kog'Maw starts a chain reaction in his body which causes him to gain up to 40% movement speed gradually over the duration of 4 seconds and detonate; dealing 100 + (25 x level) true damage to surrounding enemies.
Caustic Spittle
Range: 625
Cooldown: 8
Cost: 60 Mana
Passive: Increases Kog'Maw's attack speed.
Attack Speed Bonus: 10% / 15% / 20% / 25% / 30%
Active: Kog'Maw launches a corrosive projectile which deals magic damage and reduces the target's Armor and Magic Resist for 4 seconds.
Active: For 8 seconds, Kog'Maw's attacks gain range and deal a percentage of the target's maximum health as additional magic damage. The damage caps at 100 against minions and monsters.
Bonus Range: 130 / 150 / 170 / 190 / 210
On-Hit Magic Damage: 2% / 3% / 4% / 5% / 6% (+ 1% per 100 AP)of target's maximum health
Void Ooze
Range: 1000
Cooldown: 12
Cost: 80 / 90 / 100 / 110 / 120 Mana
Active: Kog'Maw launches a ball of ooze in a line in front of him which deals magic damage to all enemies it passes through and leaves a trail for 4 seconds which slows enemies who stand on it.
Active: Kog'Maw launches a ball of acid into the air that drops after 0.6 seconds at target 100-radius area, damaging and revealing enemies hit for 4 seconds. Enemy champions take 125% extra base damage.
Each subsequent Living Artillery in the next 6 seconds after a cast will cost 40 additional mana, capping at 400 per cast.
4800 or 
880
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