Kog'Maw Ability (LoL): Living Artillery

Kog'Maw shoots acid at an area, dealing 100 / 140 / 180 (+35% of ability power) (+0.75 per bonus attack damage) magic damage plus 0-50% depending on the target's missing health and revealing enemies hit for 2 seconds. Enemies below 40% health instead take 150 / 210 / 270 (+52.5% of ability power) (+0.975 per bonus attack damage) magic damage.

Subsequent shots within 8 seconds cost an additional 40 mana (can stack up to 9 times).