From the back of the book:
Unlock the Secrets of Dark Sorcery
Open the Crimson Pandect to reveal the hidden arts of the arcane world and the grim obsessions that snare the minds of their adepts. This book is for both players and Labyrinth Lords alike, providing tools for weaing grim tales of blood and unleashed sorcery!
Use new classes, new spells, and new guidelines for magical research. Plunder ancient troves of occult lore to fuel your arcane ascension. Use the new guide for sanctum construction and the tools for cult and cabal creation to fashion sorcerous towers and malevolent foes. The Crimson Pandect holds every tool you need to make mere magic into something worthy of a sorcerer's terrible sacrifice.