From publisher blurb:
The Book of Secrets, a treasure trove of new spells and patrons for Wizards and Elves. This compendium of lost arcane lore is compativle with Dungeon Crawl Classics and is intended as an aid for the busy Storyteller.
Inside you will find: several new banes and powers for magic weapons, 40 pre-generated magic weapons, 6 new patrons, 46 new spells, and a plethora of new ideas to inspire and terrify your players. You will find options to tweak and customize the nature of magic and how it works in your gaming environment as well as new item creation spells, the rules for spells of greater than fifth leve...and much, much more.
All just waiting for your players to stumble upon the moldering remains of the Book of Secrets.