(small spoilers, obviously)
Edwin has just left. We did his nether scroll quest and he changed into Edwina, but now, after about five days, he just left, saying 'i can see i am not going to get any help from you. I shall find my own cure.'
I have no idea what I was supposed to do for him. He WAS the only evil npc in an entirely good party, so maybe he got fed up with us? Can I get him back somehow?