"It does not block turret shots. Does eat Nidalee spears though."
"A projectile for the purposes of Wind Wall is a game object that lives in the world for some time moving along a pre-defined path. This all sounds complicated, but it tends to be much simpler in practice than in theory.
Enchanted Crystal Arrow is a missile. Fin... er... Lux Ult is not a missile.
Varus basic attack is a missile. Kayle basic attack, not a missile.
Ryze Q and E are missiles. Ryze W is not a missile.
Maokai Sapling in flight is a missile. Maokai sapling while running at someone is not a missile.
Note that missiles with extreme arcs which take them off the screen, like Kog'Maw ult or Ziggs ult are unblockable, because they travel well over the wall."
"Nope. It doesn't block champions. As for Orianna, her ball comes to a stop when it hits the wall."