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 and gaining bonus movement speed over the duration, increasing to up to to 40% bonus movement speed. He then explodes, dealing「 100 + (25 × Kog'Maw's level) 」「 125 / 150 / 175 / 200 / 225 / 250 / 275 / 300 / 325 / 350 / 375 / 400 / 425 / 450 / 475 / 500 / 525 / 550 」true damage to all nearby enemies.
Active:Kog'Maw spews a ball of ooze in the target direction, dealing magic damage and slowing enemies for 1 second. The ooze lingers for 4 seconds, slowing enemies who stand in the ooze and persisting for an additional 0.25 seconds.
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 of them for 4 seconds. Champions receive 100% extra base damage.