Vayne's Condemn should not work without a wall

I agree!

Also, she should only get her Q invisibility during Ult and her W should only proc after 3 autoattacks.

? Isnt that how it works? Otherwise its a Bug.

{quoted}

There is no reason she should get a free stun. If I am not knocked back into a wall, her shit should not stun me.

It doesnt stun you if you do not impact terrain. It is still is a knockback though. And its hardly free if it puts her E on CD and costs mana so dafuq you talking about?

...it doesn't stun you if you don't hit a wall.

There are visual bugs where it may look like you didn't hit a wall (which can happen if you were dashing as the projectile hit you) but if it stuns you, you had hit a wall after its knockback.

Besides, it's a 20 second cooldown until level 14 when she starts putting more points into it, and it costs 90 mana (highest cost out of all of her abilities) so I don't see how it's free in any regard.