So, I did the ritual in the temple of shadows but it turns out a demon is possessing her and I must get rid of it. After talking with the priest of Oghma I learned that I need a claw or tooth from a dragon or devil. Then I'm advised to deal with the dragon at Umar Hills, but even as I kill Firkraag I do not see any tooth or claw on him. The scales I got are no good for the Oghma priest to make the weapon to kill the demon possessing Fade.
Any advice?