Vault of Lights (Halls of Origination)

The Vault of Lights is a room in the Halls of Origination. After meeting with Brann Bronzebeard, adventurers must defeat the Water Warden, Earth Warden, Air Warden, and Flame Warden to re-align a series of mirrors and open a door. Stone troggs have gotten into the area somehow. Anraphet walks out of the control room after the door is open, and proceeds to sterilize the stone troggs... and the adventurers.
The vault was visited by Magni Bronzebeard and an adventurer during The Halls of Origination.