Slub

A large slug like being that can use magic. They absorb a person's magic, gaining power relative to the power of the victim. They can make some of their bodily mass fall off if they are trying to make an escape, regaining it as they eat. They eat by covering an animal in their goo body, absorbing and digesting it. It has been known to eat humans and steal all of their power. The colour of the beast changes with what magic it absorbs. They can shape shift but only once in their lifetime. They are rumoured to be a descendant of Me. Powerful mages have been known to keep them as pets and let them us some of their magic to fight alongside them. They communicate using odd gargle-lie gibberish sounds.