Forum talk:Neekerivittu/@comment-5961600-20130617092349/@comment-3419132-20130618152242

40% of your damage dealt. Not hard to calculate.

Also: If you left him with 60% hp before the ult proc, there is no way he'd die considering, while the ults damage is good, is less than your damage that you dealt during the proc. If you dealt a 100 damage, it'll deal 40 at max rank not factoring in resitances.