Alter Others

When you cast the spell, you say a body part and an animal or species (ex. "pig feet") in the direction of a creature. On a failed DC 10 Wisdom save, the affected creature's body part that you called out transforms to match that of the  body part of the animal or species you named. The spell lasts as long as the caster wills it or until it is dispelled. If the spell caster is killed before it is dispelled, then changes are permanent.

Limitation: You cannot use this spell to kill a creature or make it impossible for them to carry out necessary biological function.