Some Vayne suggestions
E - Condemn When E hits 2 or more champions, they become skewered together for 1 minute. They have to click in the same direction to move and lose 1% health true damage for each second they move.
Also, whichever team has a Vayne, their opponent's turrets will always deal the same damage Vayne deals (with Crit chance and % health true dmg every 3rd hit)
Let's make Vayne great again