The entrance to this huge dungeon is in or below a gnarled tree.
Created after the Blood Mist (1-6 years ago), dwarves built it due to vengeance.
It originally served as a hiding place but it was invaded by demons.
The dungeon is currently inhabited by goblins (p. 72), orcs (p. 64).
The cave has 73 rooms and some have a gnarly tree in them.