Talk:Karthus/@comment-24613667-20150313171641/@comment-24613667-20150314192152

You do realize that Lay Waste counts as a crit and Infinity Edge doesn't explicitely state if it only affects auto-attacks, hence why this was 'pending for test' in the first place, right?

From Lay Waste's Ability Details:

"Lay Waste hitting a single target lists damage as a critical strike both in the damage text in game and in the post-game screen, where the damage from Karthus's most powerful Lay Waste will appear in the post-game's "Largest Critical Strike" section of the graphs."

From Infinity Edge's in-game description:

"UNIQUE Passive: Critical Strikes deal 250% damage instead of 200%."

Sure, we can just assume that Lay Waste wouldn't gain bonus damage from buying an Infinity Edge because most spells don't crit, but that's not a definitive answer.