Dawn of War - Campaign: The single-player campaign is set on the planet Tartarus, an Imperial Civilised World that is under siege by a large Ork WAAAGH!. The campaign begins with Colonel Brom and his 37th Tartarus Planetary Defense Force Regiment under attack by a large group of Orks. The Blood Ravens 3rd Company, led by Captain Gabriel Angelos makes planet fall and saves Brom and his remaining men and then proceed to exterminate the remaining Orks in the vicinity. In the aftermath of the battle, Gabriel is joined by the Space Marine Librarian Isador Akios. Brom asks Isador about a recently conducted Exterminatus of the planet Cyrene, Gabriel Angelos' homeworld, however Isador makes it clear he is not to bring it up again. The Blood Ravens then prepare for a mission of extermination of the Orks surrounding the port, in order to protect the evacuation craft of the planet's population.Isador, sensing that the captain's mind is troubled, realises why, and tells him that there was nothing he could have done to save his home planet of Cyrene. However, Gabriel tells him not to mention it again, stating that his homeworld was his responsibility. After the extermination of the Orks, Scout Marines reveal to Gabriel that the Forces of Chaos are also operating on the planet. Soon after this revelation, they are joined by an Inquisitor, Mordecai Toth, who orders the Blood Angels to leave the planet, warning that a Warp Storm is approaching the planet and will consume the world in 3 days time. Toth orders a complete evacuation of the planet's remaining Imperial population. On further investigation, it is revealed that the Eldar of Craftworld Biel-tan are also operating on Tartarus. The Blood Ravens find an altar dedicated to Chaos Undivided, confirming Gabriel's suspicions, and he resolves to destroy the Traitors, unknowing that Isador is already under the influence of Sindri Myr, the Chaos Sorcerer of the Alpha Legion warband already on the world.Upon destruction of most of the remaining Eldar by Gabriel's forces, their Farseer Macha pleads with Gabriel to heed her words; however during their moment of distraction, Sindri steals an artefact, which Macha reveals to be a key to "the undoing of this world." Upon inquiry, the Biel-tan Farseer shows surprise at the Astartes' ignorance, commenting that the Inquisitor "keeps them on a short leash" and implying that he knows more than he is telling, and advises them to ask him, before telling the Blood Ravens where to find the entrenched Chaotic forces. Gabriel and Isador confront Inquisitor Toth in the ruins of a temple of the Imperial Cult, following a pitched battle with Alpha Legion forces, and Toth reveals that the world is cursed, and was home to an artefact of Chaos: the Maledictum, a stone that contains the essence of a Greater Daemon of Khorne. The forces of Chaos now bear all that they need to unearth it. Toth also explains that the Eldar were fighting to protect the stone, as it was they who imprisoned the daemon in the stone originally: as he puts it "as Chaos's oldest enemy, the Eldar see themselves as the only capable defence against its influence. And we have paid for their arrogance." Toth also says that the power of the Maledictum is enough "to turn the faithful and drive men mad", having already corrupted much of the population of Tartarus and the Imperial Guard, as well as affecting the Blood Ravens somewhat with its Chaotic influence. Gabriel and Toth form an alliance and make plans to find and destroy the Maledictum, however, Isador is then completely overcome by the temptations of Sindri and Chaos, and resolves to steal the Maledictum for himself.The Blood Ravens destroy the army of the Alpha Legion's Chaos Lord Bale, who was betrayed by Sindri, during which time Isador seizes his chance and steals the Maledictum. In the face of Isador's betrayal, Gabriel pursues him in an effort to bring him to justice. The Blood Raven forces are successful in destroying Isador’s Traitor Imperial Guard troops and Gabriel defeats Isador in single combat. Isador pleads for forgiveness to Gabriel. Gabriel tells him, "If redemption is what you seek, then that is what I will give you," before shooting him in the head with his Bolt Pistol, using his former friend as an example to his fellow Astartes of the insidious dangers of Chaos. Inquisitor Toth then reveals that he had known that Chaos was corrupting one of the Space Marine officers on Tartarus, but he had suspected it was Gabriel, not his Librarian, and they had paid the price for his error.Meanwhile Sindri had used the power of the Maledictum to turn himself into a Daemon Prince. Inquisitor Toth bequeaths the Daemon Hammer God-Splitter to Gabriel. They then, with the Blood Ravens and the aid of the remaining Eldar forces of Farseer Macha, attack the Chaos forces, eventually killing the Daemon Prince Sindri. The final scene sees the Eldar and Blood Ravens standing around the Maledictum. Despite the warnings of Farseer Macha, who begs them not to destroy the stone, Gabriel obeys Inquisitor Toth and his own judgment, and destroys the Maledictum with God-Splitter. The Eldar forces then retreat, Macha warning prophetically that Gabriel has doomed them all, and the Blood Ravens leave to be evacuated. However, Gabriel stays back, and encounters the Greater Daemon of Khorne, an unnamed Bloodthirster, which he unwittingly released from the Maledictum. The daemon lets Gabriel and his men leave safely as thanks for its release, but tells Gabriel that he will soon come to claim him and his men. Gabriel vows to destroy the daemon, before following after his departing Astartes.