Desert is an isolated region in the Underworld. It can accessed by using the portal located in the Minotaur's Labyrinth, located in Knossos. Not much is known about the Desert, except that it features the Bad Omen. The Desert has the ability to transform itself into anything devilish or of hostile nature, most notably the Swamp of the Dead. Mathayus, Layla, Ari, Fung and the Illyrian Fellowship journeyed to the Desert to acclaim the Sword of Damocles. Pollux turned to stone in the Desert, when he failed to reach back to the within the prescribed hour.