The shrine on the left is the adventure's main location. My description for this shrine read:

"From a mirror-like brass floor, unbroken walls of twisting flame rush upwards on all sides, forming a vast hall of living fire that arcs into a writhing dome of flame far overhead. Crackling heat and the fire’s roar fill the hall. At the hall’s center, a low platform bears both a massive brass gong and a majestic iron brazier emitting a silver flame. A second platform supports a colossal, free-standing archway carved from blood-red stone and festooned with black chains. Three smaller, free-standing archways adorn entrances to fiery alcoves sweeping away from the main chamber.

"Dozens of yards up, gigantic brass gargoyles lean down through the flaming walls. They depict chain-wrapped, serpentine monsters with azer faces. These sculptures redirect the fires through which they emerge to form their flaming manes, their chains of fire, and their burning eyes."

The areas labeled "T1" and "T2" represented trapped floors that dropped intruders into the magma chamber below. The circles labeled "W" represented great trap doors through which an enormous and ancient fire elemental shaped like a gigantic worm comprised of spiraling fire, magma, and cinders can rise up from the magma pool in the chamber below.