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Field Guide on Werewolves, and those who hunt them.
by Dr. Johan Kosdin Lerkoviski
Known Lycanthrope Hunter, Specializing in Werewolves
The greatest book ever written! HA-HA!
The desert is a curse from the Water God upon the wicked people who live in the South.
Said people offended the Water God in some way, and so the Water God placed water-trappers, bizarre, water-sucking beings, in the soil, and within years, the wilderness became a desert.
Thus, the desert folk shamans have special powers that allow them to find water-trappers so that they can be dug up and their water harvested.