Sinopsis Film :
Captain Severus of the Ultramarines Chapter receives a distress signal on the planet of Mithron.[9] The only site of importance is a shrine guarded by a full company of the Imperial Fists, implying that if they are calling for help, matters are truly dire. Leaving the bulk of his company on Algol to continue an ongoing campaign, Severus sets off for Mithron with only the ten-man Ultima Squad for support. Accompanying is Apothecary Pythol, a veteran of many battles and Severus's de facto advisor. In the squad itself, Battle Brothers Proteus and Verenor are the most eager to prove themselves in battle. On the tough and unforgiving surface of Mithron, Ultima Squad discovers that a terrible battle has taken place. The planet's Imperial shrine has been desecrated, the Imperial Fists detachment has been annihilated and vile evils unleashed. As unseen dangers close in around them, the recruits have to mount a tense and deadly insertion to find any surviving Imperial Fists, and the reason behind the distress beacon.
While investigating the ruins of the shrine, the Ultramarines are ambushed by Chaos Space Marines from the Black Legion. Several Ultramarines, including Sergeant Crastor, are killed but the ambush is thwarted. The squad continues on but they are again ambushed, this time by a Daemon Prince. The Daemon kills another Ultramarine and engages in combat with Captain Severus, and both combatants tumble over a cliff. With Severus gone and Sergeant Crastor dead, command of the squad falls to Proteus. While the rest of Ultima Squad wants to return to their strike cruiser and wait for reinforcements, Proteus decides to continue on to the distress beacon. At the reliquary at the shrine's summit, they find Chaplain Carnak and Brother Nidon, the sole surviving Imperial Fists. They reveal they have been protecting the Liber Mithrus, an ancient tome given to the Imperial Fists at their founding by the Emperor himself, and is a sacred relic to them. Ultima Squad agrees to help Carnak and Nidon take the book to safety, but Verenor and Proteus are suspicious about how just the two of them have managed to survive for so long.
As Ultima Squad retreats to the extraction point, they are attacked by a massive force of Black Legion Marines. During the fight, Ultima Squad kills many of the attackers, but suffer heavy casualties as well. When it looks like Ultima Squad will be overwhelmed, Severus suddenly appears and with his help, the remains of Ultima Squad, Carnak, and Nidon manage to escape back to the strike cruiser. Upon their return, Proteus confides to Severus about his suspicions of Carnak and Nidon. Both Proteus and Severus confront the Imperial Fists, with Severus taking the book and discovering that it is empty. Declaring that Carnak is tainted by Chaos, Severus shoots and kills him. However, Proteus figures out that Severus was possessed by the Daemon that he fought. The possessed Severus knocks out Proteus, kills the remaining members of Ultima Squad, and heavily injures Pythol. Proteus, Verenor, and Nidon chase Severus and confront him in the ship's reliquary. Severus knocks out Verenor and Nidon and pins down Proteus. He reveals that he plans to possess Proteus, and while disguised as him, stow away on the strike cruiser to reach the Ultramarines' homeworld of Macragge, whereupon he will use the Imperial Fists' tome to open a warp gate, allowing a horde of daemons to descend upon and destroy Macragge. Pythol, however, arrives to help but Severus kills him. However, Pythol's sacrifice allows Proteus to escape Severus' grip and grabs one of the Ultramarines' sacred weapons, a Thunder Hammer. Proteus uses the Thunder Hammer to kill Severus and banish the Daemon possessing him.
Afterwards, it is shown that Proteus is eventually promoted to Captain with Verenor as his second in command, and both Marines are preparing to lead their own Ultramarine squad into battle.
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