This is a study of the effectiveness of not the individual but a group of individuals. This is an Open Ended Plot which will not be fleshed out by a single person but by who ever chooses to add content.
Shadows gather…and linger.
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.