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{{GreyKnightsPortal}}

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]].{{Fn|1}}

==Overview==

According to the [[Horus Heresy Series]], the Terminus Decree concerns the anti-astartes phage developed by the mad scientist [[Basilio Fo]]. The information was gathered by [[Malcador the Sigillite]] and telepathically passed onto his [[Malcador's Chosen|Chosen]], [[Khalid Hassan]].{{Fn|3}}

The 5th Edition Codex{{Fn|1}} states that only the Supreme Grand Master is aware of the decree's existence, which would preclude the non-Supreme Grand Masters of the order discussing it.{{Fn|2}}