Boneyard

Boneyard
A boneyard is a huge, potentially gargantuan, pile of bones. They just kind of sit there. It's a pile of bones.

Adil has a mild phobia of them, to the extent that he made up a story about seeking out a new home for his people just so he could become a "Seeker of the Misty Isle" for a single class ability which allows him to never get his bones ripped from his still-living body again.

Combat tactics
The boneyard hides in the yard full of bones, then erupts from itself to grab a victim with an obscene grapple check. It then picks the bones from the victim without bothering to kill them first, doing massive total bullshit.

Notable examples
The first one was in Lord Drake's demon-infested wine cellar.

The second one was in Lord Charon's tunnel of love, guarding a strange goo fountain.