Talk:Athene's Unholy Grail/@comment-25867286-20160504212218/@comment-24613667-20160807155042

(old comment is old)

In other words, you gain charges based on the raw damage that you would deal to enemy champions (ignoring their resistances). So, if you're ability says it deals 180(+30) damage on the tooltip, then you'd gain 20% of that as Blood Charges when you hit an enemy with it (42 charges, in this case). It's not limited to abilities though, you gain charges from dealing ANY damage to champions.