They are the ghosts of those who died in the desert, and forced to wander lost for all eternity, or at least until their thirst is healed.
Physiology and traitsEdit
Unlike most ghosts they seem to have physical appearance, almost like a zombified man,perhaps even the husk or skin of the former person, wearing the clothes of that person. Being more 'physical' than ethereal they are capable of holding physical objects directly. They have pale white skin, and red flashing eyes.
They may also take the form of a whirlwind near the site of their corpse.