How do I beat a fed Vayne
OK so situation botlane fed Vayne and I'm playing as Azir who went even (It wasn't the best game, I hate heimerdinger) and every time a teamfight came around the ended up melting me, if I tried to escape with my E she would often spam roll to get closer to me, if she managed to get close enough to autoattacks she would melt me, if I tried to set up a Q E R combo she would roll, if I had her on the brink of death she would ult invisible and then melt me before I could reposition my soldiers.
My build was

and I had room for one last item, I planned to go Rylais
WHAT CAN I DO TO BEAT THIS MONSTROSITY.
or an emergency
. Or maybe
and save it just for Vayne.
. Everyone can afford to have one defensive item, or maybe you can opt for 