The BigTree structure is a pre-built castle generated by the Better Dungeons mod. It spawns in the Plains, Meadow, Savanna, Shrubland, and Wasteland biomes. The tree has a hollow trunk, a chest with basic stuff like seeds and wheat and an interior ladder leading to two rooms. Armored skeletons/zombies/golems guard the tree. There is also a three level dungeon under the tree, which can be accessed by a stairwell behind the ladder in the center or the tree. The Boss will either be a necromancer, liche, or golemboss, if guarded by golems.