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{{ImperialFistsPortal}}The ''''Liber Mithros'''' is the name given to an ancient codex of dark power given to the care of the [[Imperial Fists]] [[Chapter]].{{Fn|1}} 

According to [[Chaplain]] [[Carnak]] of the Imperial Fists 5th Company, the [[Emperor]] himself gifted the book to the chapter at its inception, making it at least over 10,000 years old. A shrine to house the tome was constructed on the world of [[Mithron]], protected by an entire company of Imperial Fists with attending [[Imperial Guard]] units.{{Fn|1}}

In the 40th Millenium, the shrine came under a vicious attack by [[Black Legion]] traitor space marines, whom the Imperial Fists and Guardsmen managed to hold at bay for three weeks while calling for reinforcements. Then, a [[warp]] portal opened in the sky, unleashing a horde of [[daemons]] that massacred almost the entire garrison, desecrating the corpses thereafter. By the time [[Ultima Squad]] under [[Captain]] [[Severus]] of the [[Ultramarines]] arrived, only Carnak and brother [[Nidon]], who was charged with personally carrying and protecting the book, remained. Surviving another attack from the Black Legion, the two Fists and remaining Ultramarines evacuated to an orbiting Ultramarine [[Strike Cruiser]]. When Severus was revealed to have been possessed by a daemon himself, he killed most of the marines, including Carnak, and took the book to the ship's reliquary with the plan of creating a portal over the Ultramarine homeworld of [[Macragge]] to grant the planet a similarly grisly fate to that of the Mithron shrine. This plan was narrowly foiled by Ultramarine brothers [[Proteus]] and [[Verenor]] shortly before the ship exited the [[Immaterium]] above Macragge; what became of the book afterwards is unknown. {{Fn|1}}

The book's pages appear to be blank when dormant but, with dark incantations, writing will begin to appear in the pages that seem to allow the user to create a warp portal at the desired location.{{Fn|1}} ==Sources==*{{Endn|1}}: [[Ultramarines - A Warhammer 40,000 Movie]]