Absolutely amazing!! I had planned a Calimshan desert homebrew and this fit perfectly. Great resource, helped me fill gaps and save time planning. The material and history is accurate and well put together from various cited sources. Encounter tables super useful, and great subclass options such as circle of stone for Druids(sand druid). I was so impressed with this work, I had it color laser printed and coil bound into a hard cover booklette!! A+