Liber Chaotica

The Liber Chaotica is presented as a collection of writings by a scholar driven mad by his research into the Ruinous Powers. Each section is devoted to one of the four Chaos Gods — Khorne, Tzeentch, Nurgle, and Slaanesh — and a fifth section covers Chaos Undivided.

The book's in-universe framing device creates an unsettling reading experience, with the narrator's sanity visibly deteriorating as the text progresses.