Talk:Kog'Maw/@comment-10880231-20140419105523/@comment-15667791-20140507003651

^ I second that. To quote the spell vamp page:

"Spell vamp is a magical stat that converts a percentage of the ability damage dealt to health regained. Activated abilities that do not state they "apply on-hit effects" or modify your "next basic attack" will benefit from spell vamp."

It also states that non-magical damage can proc spell vamp as well, as it does. Physical damage spells can benefit from spell vamp as well, so long as they aren't deemed a physical attack, such as Ezreal's Q, Fizz's Q (physical part), or Miss Fortune's Q. Poppy's Q is another story.

Since Bio-Arcane Barrage states that it's an on-hit effect, spell vamp should not be procced. The basic attack will proc life steal, but one thing wrong with the person above me, as the life steal page states...

"Life steal is an offensive stat that converts a percentage of the physical damage dealt to health regained. A champion's basic attack, abilities that apply on-hit effects, and abilities that modify your next basic attack all benefit from lifesteal."

... Life steal is based completely on physical damage. It's very inconsistent, but nonetheless, that's the mechanic.