A large, lava-filled cavern leading to Royotia. It's dangerous, but less so than the mountain pass. This location has two areas and is missable. To gain access to the first area use the south exit of The Great Sand Sea. The locked doors are opened via the quest Into the Abyss or (if you didn't do the quest) by talking twice to the Marquis Priam in Royotia after Wyrmskeep.