The VOIDRUNNER'S CODEX is LIVE! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
I like the idea of sharing the polymorph subschool spells with your familiar. Turning it into a beholder (where it can hide behind and snipe away) or dragon (the 150 temp hp should help some) seems quite cool.