Im on to something aren't I? I feel like I am close after what you said....
Irelia is the only one without an AoE slow?
Huh, didn't think of that. Good guess, but not what I was looking for, sorry.
Twisted Fate is the only one with hybrid scaling(i.e. (+x AD +x AP)).
Viktor is the only one with a stacking slow.
Irelia also has both AD and AP scaling on her Transcendent Blades. (That said, no, those aren't it.)
Leona is the only champion unable to deal damage from range?
She's got Solar Flare..
Pantheon is the only one whose stun does not also have the ability to slow
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