Ability upgrade tool tips would be nice.

R0BP0CALYPSE

It would be great if you could see what each skill upgraded did at every level, what level it was obtainable at, and maybe even what it cost. It would just be nice to know what a hero is going to evolve into before you invest in it.

Stekcir_Leinad

+1 I've just been thinking the same thing. Had to do some Googling to find a semi helpful guide.