Sibl is an elder mimic. A wood elemental creature that has preyed on the unwary for years, disguising herself as an ornate treasure chest. Thanks to accumulated power, age, and a wealth of magical items, Sibl has the ability to take on a humanoid form. Why she looks more comely than monstrous has a bit to do with the caster she devoured whom she got the idea for the ability from and her natural tendencies toward being closer related to dryads than treants. She's bounced around from place to place in busy dungeons to fool adventurers and to secure items for fearsome creatures who desire to keep them out of the hands of meddling adventurers.

At the moment she's between dungeons, looking for the next brutish "Boss" to feed her insatiable hunger for more tantilizing treasure.

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Sibl may as well be an optional boss in an RPG. I wanted to think of a few ways a monstergirl could be the type of monster adventurers shiver at the thought of when they delve into the dark spots of the world.