PassiveIcathian SurpriseUpon dying, Kog'Maw starts a chain reaction in his body which causes him to detonate after a few seconds, damaging surrounding enemies.
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PassiveIcathian Surprise 
QCaustic Spittle
WBio-Arcane Barrage
EVoid Ooze
RLiving Artillery
Classic champion edition
Kog'Maw
ClassicThe Mouth of the Abyss · Marksman / Mage
Champion abilities
Review the Classic kit and client description. Classic data stays separate from the modern edition.
PassiveIcathian SurpriseQCaustic SpittleKog'Maw launches a corrosive projectile that damages his target and corrodes their Armor and Magic Resist.
WBio-Arcane BarrageKog'Maw's attacks gain range and deal a percent of the target's maximum health as magic damage.
EVoid OozeKog'Maw launches a peculiar ooze which damages all enemies it passes through and leaves a trail which slows enemies who stand on it.
RLiving ArtilleryKog'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.