Graia
You were Captain Titus of the Ultramarines, sent to defend the forge world Graia from an Ork invasion. Its factories and gigantic Titan war machines had to survive until reinforcements arrived. You boarded an Ork vessel and brought it down, then regrouped with Sergeant Sidonus and Leandros. Leandros questioned your tactics whenever they departed from the strict guidance of the Codex Astartes.
The Manufactorum
You met Lieutenant Mira, who was holding together the battered Imperial Guard defenders. You destroyed an Ork-controlled gun battery so reinforcements could land, then advanced toward the Titan manufactorum. Inquisitor Drogan directed you to an experimental power source. Retrieving it unleashed an explosion that should have killed you. You survived, leaving Drogan puzzled and your companions faced with your unexplained resistance to its energies.
The Psychic Scourge
You accepted Drogan's plan to power a weapon called the Psychic Scourge and destroy the Ork horde. Instead, firing it opened gateways to the Warp, unleashing daemons and Chaos Space Marines. Their leader, Nemeroth, revealed that Drogan was his puppet. You had delivered the power source into a trap. Warboss Grimskull attacked Nemeroth, giving you and your brothers a chance to withdraw.
The Titan
You returned to the manufactorum, intending to use a Titan's weapons against the spire sustaining the Warp portal. Grimskull attacked again, and you killed him. With their leader dead, the Orks began to fall back. You powered the Titan with Drogan's device and shattered the spire, closing the portal. But as you prepared to evacuate the power source, Nemeroth ambushed Sidonus, killed him, and seized it.
Nemeroth's Ascension
You pursued Nemeroth to the damaged spire as Space Marine reinforcements arrived. He intended to use the stolen power source to become a daemon prince. He claimed your resistance to the Warp marked you for Chaos too, but you rejected him. Before his transformation could finish, you hurled yourself at him. Falling from the spire together, you crushed his skull and defeated him. You then tore the power source apart so it could never be exploited again.
The AccusationThe ending
You returned to Mira and Leandros with Graia's invasion contained. Then an Inquisitor arrived with Black Templars: Leandros had reported your resistance to the Warp as evidence of corruption. You denied betraying the Emperor but could not explain that resistance. When the Inquisitor threatened to investigate everyone who had served with you, you surrendered to protect them. You left Graia in custody, with your fate unresolved and Sidonus dead.
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Written by an AI model from the game's wikis, and checked against them part by part by another before it was put here.