Arcana of the Ancients brings the wonders of mysterious technology and weird science-fantasy elements to your fantasy campaigns. Designed by fantasy masters Monte Cook, Bruce R. Cordell, and Sean K. Reynolds, this gorgeously illustrated sourcebook gives you everything you need to add a whole new element to your Fifth Edition game.

Arcana of the Ancients includes:

• Hundreds of cyphers, artifacts, and other items that incorporate science-fantasy technology.
  
• Over 50 science-fantasy creatures, each with awe-inspiring artwork and complete 5e stat blocks.
  
• Pages of GM advice and guidelines for adding science fantasy concepts to any existing fantasy campaign—or building a brand new science fantasy campaign from the ground up.
  
• The Hills of Crooked Sleep, a hefty adventure you can insert into your campaign right now to introduce ancient civilizations, weird technology, and new strange creatures. Plus additional full-length adventures!
  
• An introduction by Jim Davis and Jonathan Pruitt of Web DM.