Am I the only one that thinks Banshees is weak?
It's passive in particular. Having 1 spell shield that can literally be procced by 1 of ahri's fox fires is not useful. The passive is almost useless in teamfights. Abyssal Scepter was a much better item, it gave HP stats, AP, and more MR.
vs ahri, reduces her ult dmg an fox fire, although yes banshees pass shouldn't go back to 40 just because you get hit, it should be 30 seconds and get reduced cd when hit an not active. although not having foxfire count toward its spell shield would also work for what you want.