The Volcanic Depths

Publisher's blurb:

Temple passageways slowly turn into crumbling tunnels as you descend deeper into the volcanic depths. You arrive at a large cavern where some of the floors have collapsed, the holes now leading down into flowing rivers of magma. Bursts of lava occasionally erupt from pools searing the stone floors above.

Some of the temples architecture has survived down here, strange stone pillars that have been carved with the shapes of demonic creatures, and looming statues that hold greatswords.