It blocks everything from skillshots to even auto-attacks, but is there any skills that go through it? Things I have in mind would be dashes or certain attacks like Lux's ult.
How does it interact with returning spells (Ahri Q, Draven ult) or AOE spells. Do those spells still return to Ahri/Draven or just dissipate? Does AOE counter this wall such as Nasus or lux E's? Are bouncing projectiles blocked as they hit the wall?
Best Answer
There are some Exceptions for the wind wall. Some of them are (most likely) bugs and others are projectiles that don't dissapear but just can't pass the wall.
List. Spells/auto attacks that are blocked are BOLD you can assume the rest is not blocked. If there is as spell with special behaviour I will point this out. The list would be too long if i counted every spell that doesn't get blocked.
Champions where no spell/AA can be blocked are ITALIC
For Items or special things Here's another list of things that get blocked:
Things that aren't blocked but still are projectiles somehow:
I'm pretty sure this list is accurate BUT there can be some mistakes after writing for 1 hour ;)