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From Warhammer 40k - Lexicanum
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The '''Terminus Decree''' is an ancient scripture or instruction written on a simple piece of parchment and locked away within the [[Chamber of Purity]] on [[Titan (Moon)|Titan]] making it a sacred relic to the [[Grey Knights]] [[Chapter]]. The existence of the this artefact is known only to the [[Supreme Grand Master]] of the Grey Knights and no record of it can be found in any library in the material realm.
Such is the power of '''Terminus Decree''' that it is to be opened only in humanity's darkest hour, when all hope for our race is lost. What happens once the box is opened and decree is spoken by the Supreme Grand Master is infinitely dangerous and will either save mankind from certain defeat or doom us to oblivion for all eternity. In this capacity it is the ultimate sanction of the Grey Knights, to be used only as a lst resort, when all other options have failed.