Bone Cathedral

Raise a massive bone structure in a 120-ft. cube centered on a point within range. You may create walls, bridges, stairs, cages, pillars, cover, doors, spikes, and platforms of bone. Structures have AC 18 and hit points determined by the GM by size. Hostile creatures in spaces where structures appear must make a DEX save or be pushed to the nearest unoccupied space and take 33 (6d10) piercing damage. The cathedral counts as difficult terrain for hostile creatures, and you may reshape one 30-ft. section as a bonus action.