The lost souls of the great desert

In the bitter coldness of the desert night, beneath the pale light of the stars, many travelers tell of ghostly apparitions wandering the silent dunes. Clad in traditional clothing that flutters in an unseen breeze, their figures are distorted by a shimmering aura, like mirages shimmering in the heat of day.
They only appear briefly, like fireflies of the desert and seeing one is considered to herald good fortune or a terrible fate.