It remains one of the greatest unsolved mysteries in the Warhammer 40,000 universe—at least until now. Through a brand-new codex, Games Workshop has finally unveiled the true nature of the long-debated Terminus Decree, leaving many dedicated lore enthusiasts wishing they hadn’t seen it.
For those unfamiliar with the lore, the Terminus Decree is the final command issued to the Grey Knights, widely regarded as the most enigmatic Space Marine Chapter in the setting. This order was given just before the Emperor was interred on the Golden Throne after suffering a mortal wound at the hands of Warmaster Horus during the climax of the Horus Heresy.
(For further details regarding the Emperor’s current... condition, you can read this article here.)
The lore dictates that only the Supreme Grand Master of the Grey Knights holds the authority to open The Terminus Decree and determine its exact contents. Functioning essentially as a ‘break glass in case of emergency’ Pandora’s box, it has captivated Warhammer 40,000 fans for years who have speculated about what lies inside.
With the recent release of the new Grey Knights codex—a comprehensive volume featuring background lore, miniature photography for tabletop gaming, and updated rules—Games Workshop has revealed, for the first time, exactly what The Terminus Decree entails.
Warning! Spoilers for Warhammer 40,000 lore follow:
