The Mark of Tzeentch is a Mark of Chaos given to the most devoted followers of Tzeentch, the Changer of Ways, bestowing them with potent psychic powers. The emblem glimmers with a distracting sparkle that flickers at the corner of the eye, almost like a gateway to the Warp. Heretics with the Mark of Tzeentch are marked with either a physical mark inscribed on a prominent part of their body, or a hidden but equally permanent mark upon one's soul. These characters are constantly compelled to discover hidden secrets to share with the God of Change. The greatest followers of Tzeentch are the Chaos Space Marines of the Thousand Sons Traitor Legion, both their Chaos Sorcerers, and the Rubric Marines they control, are preferred agents of the Lord of Change's will. These sorcerers are the most powerful bearer of this mark.
- Black Crusade: Core Rulebook (RPG), pp. 82, 87
- Codex: Chaos Space Marines (6th Edition), pg. 30
- Codex: Chaos Space Marines (4th Edition), pg. 25
- Codex: Chaos Space Marines (3rd Edition, Revised Codex), pg. 59
- Codex: Chaos Space Marines (3rd Edition, 1st Codex), pg. 29
- Codex: Chaos (2nd Edition), pg. 27
- Realms of Chaos: The Lost & The Damned (1st Edition), pg. 55