Cult of Tzeentch
The Codex of Unspeakable Damnation
The Codex of Unspeakable Damnation, or just The Codex, is a thick tome written in the arcane language of daemons. The tome is bound in some form of black leather and is adorned by a horned skull which seems to whisper to you when you are close.
Inside The Codex you can find instruction to rituals and blood sacrifice, information about the Chaos Gods and subtle hints that slowly but surely twist any man or woman that reads it into worshipping those very gods.