Another L-shaped room, this one is entered from the West and you exit to the South. On the North and East ends of the corridor you follow are enclosed spaces each with a Hydra and three treasure chests (no Mimics) behind Lightning fields. Don't waste your time dispelling the fields, though. At the bend of the room is a campsite with four Wizards and a treasure chest. When the Wizards are dealt with, put half your heroes facing one Hydra, and the other half facing the other. Then send one hero to the chest the Wizards left behind. As soon as he stands on it, the fields drop and you can take out the Hydras and get their treasure.
There is nothing else of note in this room.