From publisher blurb: Arcana of the Ancients is a forthcoming sourcebook for 5th edition players and GMs to bring the wonders of mysterious technology and weird science-fantasy elements to their traditional fantasy campaigns. Designed by Monte Cook, Bruce R. Cordell, and Sean K. Reynolds, all of whom have years of professional design experience working on the world's most popular roleplaying game, this gorgeously illustrated hardcover sourcebook gives you everything you need to add a whole new element to your 5E game. This is a selection of science-fantasy creatures and items you can use in your 5E campaign today.