User blog comment:Krauserlols/Is Riven a real Wind Master?/@comment-6191229-20131217041051/@comment-16963511-20131217103430

I don't think Riven has anything to do with psychic stuff either.

"but her true strength lay in her conviction"

So says the Lore. Ki is supposed to be a manifestation of the fighting/vital spirit of the warrior. It is her conviction and her lack of doubt in her actions that made her capable of using such techniques. She's got nothing to do with someone like Irelia who can control her blade with her will. (And about the "Ivy" stuff, i wouldn't compare Riven to her. Riven's sword's as much a part of her as for any swordmaster. Ivy's sword has a will, Riven's hasn't.)

As for the wind slash... Well, it could be a strike so powerful that it unleashes a wave of wind ; could as well be the same energy as in Ki Burst. Could be anything. Actually, I don't need any precision about this, as long as it allowed the LoL Lore to become more interesting.