Edge of the night is a toxic item

and is gona cause a lot of balance problems. It's gona mess champions with delayed burst -> (soon to be fizz, zed, karthus, a garen that jumps on you {because u can pop the sheild the moment he jumps on you and he has to hold off using his ult, by which time you can walk away from him} an ap ekko who has gone through the trouble of landing his stun, and there are many more examples liek theese.

And champions with instant burst or burst that is based on auto attacks will be completely unnafected by theese.

Now zhonya actually kinda does the same thing (kinda) but it has a 120 second cooldown and doesn't give THAT much ap..

While this item has a 10 second uptime and ONLY a 30 second cooldown.

They are trying to balance it with a 1.5s cast time on the sheild, but all this will do is make it good against predictable burst and horrible against instant burst (which actually needs counterplay)

If an adc is cought out of position they should die for it or get rescued by a support, not pop a bs item and walk away scott free