The spell allows a caster to turn another into a cat by getting them to eat cookies made from the spell. Manannan has used this spell on some of his victims and rivals. Alexander has used this spell to get revenge on Manannan and affect his own escape from the evil wizard. There are no known cures, there is no record of it simply wearing off. However it is known that the caster of the spell can cure the spell, but the means to that are lost to time.