I'll name a few:
I'm wondering is it about 40% of Champions that have an AOE attack?
List of champions without AOE damage: Poopy, Vayne, Warwick
If you count Auras and secondary effects, then all do. I can't think of any that don't :S
OH! Vayne has only single target. I think.
champions that DON'T have an aoe ability would be shorter than one of champions that DO have aoe abilities
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