Desert

Deserts can appear anywhere on a world where precipitation is scant, even along some oceans. Any large landmasses that entirely lack bodies of water are likely to be deserts.

Terrain typically difficult or greater difficult terrain
Resources water sources (underground springs, oases, and streams), mineral wealth
Secrets forgotten civilizations beneath the dunes

Desert Geomancy

Sandstorms rage as the sun glares down oppressive heat, only to retreat into a frigid night. Life is harsh in the desert, and only the powerful and adaptable survive; the desert's geomantic energies reflect that truth. When the environment is unforgiving, so is the geomancer, who brings forth punishing magic as merciless as trackless stone and sizzling sand.