Info...
Aurora Quill is a monster pony that can shape-shife into any living thing. (Pony, Bat pony, Kirin, Zebra, Changeling, etc)

Aurora Quill's mouth can stretch open, long enough to swallow a large pony in one gulp! (Note that her mouth can be closed normally.)

Quill's tongue is extremely long and can be launched out of her mouth at high speeds towards a pony. If the pony doesn't dodge her tongue in time, it will immediately wraps around the pony body and drags them towards Aurora Quill, where she begins swallowing them.

Aurora Quill lives in a boarded up abandoned mansion outside of Ponyville. Some say there are very rare items and gems inside, however no pony is allowed to enter the mansion after 4 ponies went missing within the same day.

From what my insider told me, one of the mane 6 will be entering the mansion to find out if the rumors are true about there being a long-mouth monster inside.