Maggot Ursa (Fun)

Appearance
Take a sick bear, give it a dark grey paintjob and fill most of its mouth with maggots that are half teeth and half gluttony. There you go.

Information
The Maggot Ursa is a "normal" Abyssal bear that happened upon a particular kind of bees, the blood-honey bees, in its search for honey. In a twist of magical evolution, the bear devouring the bees' larvae causes them to not die or get dissolved but rather mutate into a different stage. The transformation takes several weeks, then the blood maggots burrow out of the stomach and begin replacing the bear's blood with their own bodies. Then the internal organs. When the bears teeth finally fall out, after years of going through the strengthening torment, and are replaced with specialized teeth-maggots, it's transformation is complete.