Original submission from original artist I found here I think https://www.furaffinity.net/view/19885822/ via  ViewtifulFennec
Adopted from  Bruyaglovae

I have no info to go off besides this ref and her name, and she's joining my cast now so she will probably be different ability and personality wise.
Feit the raptor is another of my semi-wild (aka sapient, but living outside of society, like Gramzon or other dragons) He main ability if a very fast, crushing digestion, and limited size stealing. The more she eats in a short time frame, the more she can digest into more of herself to grow. Her base size is about 7.5 feet tall, and goes up and up during digestion, capping out at a size somewhat over a normal t-rex, about 2 stories tall, or 30ft or so, allowing towns or actual t-rexes to disappear inside her. If unable to keep up a very steady supply of more and more victims, she will degrade in size over time.

An ability I'm not sure if is canon but I might try is, as long as she is not under the effects of antimagic, being slain above perhaps... 15 feet tall allows her to magically respawn a few miles away from her site of death, helping provide insurance when devoured by other large beasts due to causing trouble with her appetite, with limited memory of the events.

Unlike typical dragons, her hide isn't very tough with so many feathers taking up the real estate, so when in combat she may be more liable to fall to typical weaponry of town defenders, adventurers, or other predators.

Like most of my cast she will likely be a fatal, oral vore switch with disposal and such