The Ancient Temple
This temple appears to date back to the Age of Demons. It is a holy site to the locals and was guarded by centaurs along with its own defenses.
The temple had many defenses including summoning traps, drowning traps and poison gas traps. The inner chamber contained several roughly purple crystal structures. When the purple sword was placed into the base of the central statue, it apparently broke and ancient binding.
Several devils, and one angelic woman were released from their crystal prisons. The woman’s staff was stolen by a cleric of The Order of the Emerald Claw, and several of the devils escaped immediately after their release. The woman was initially unconscious, but regained consciousness after reaching the surface and promptly teleported away.
The base of the woman’s pedestal was a Philosopher’s Stone which the party was able to use to return to life.