Hey there! I have been done with Avalon for awhile now, but I really really think that after you save the king, you should get the horned crown as a hat. The item could give you a Pendragon polymorph. I think that would be amazing!
That sounds like a really cool idea but the polymorph should be like an attack one like the ones in Khrysalis or the maycast ones on the wands of the max terror hoard packs