It’s an undead baby dragon, produced by a failed magical spell. It probably would be cute if it weren’t partially decayed.

Young dragons are relatively defenseless. They are born with relatively soft scales, which are shed and replaced with harder ones as the hatchling matures. Once a hatchling’s wings grow in, it typically marks the beginning of maturation. At this point they are often capable of hunting on their own and are usually left alone by their mother.

Urinous is a nasty little creature: possessive, irascible, brutish, and smelly. That's not so different than when she was a living magnesium amphiptere, except she is only active for a few hours at night and will never be able to fly, so some say her current state is a big improvement. She seldom behaved in life and viewed her own parents with disdain, even stating that she would kill them when she's grown. Her death is tragic because she was a young dragon with potential, but not very many community members seem to be prioritizing finding a way to put her soul to rest.