The passageway opens into a large circular room. In the center is a large fire. There are four alcoves spaced about the room walls. The scene on the ceiling is though a sight out of a nightmare.
Near the top of the room, writhing on the thermals, are four (4) elemental fire Leeches.
These creatures are native to the Elemental Plane of Fire where they are analogous to Giant Leeches. Instead of draining blood the drain heat.
There are also 1d4+4 Fire Opals found on the ground here, worth 100x1d6 GP each. They are from the Elemental Plane of Fire and are worth twice as much to an alchemist or wizard specializing in fire magic.