Pioneering new vistas in technology, the Kanmusu are sentient autonomous ships.
Not to be confused with autons, auxons are small machines, 1 to 3 inches in length, that are used for large scale, long term, resource extraction.
A secret project of the Anunnaki, the first post-human phenoclade
The PCs encounter an elaborate trap room, designed to fill with water, drowning those inside. Clever and resourceful, they disable the trap and move on.
Only later do they discover that this room is part of the elaborate cooling system that prevents beasts of elemental fire from overrunning the complex. While the fiery beasts run rampant, they begin setting fires, which causes the complex to become increasingly hot and smoke-filled. Additionally, the PCs now have to fight their way out past aggressive fire creatures...