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Omar was asked by Eris Morn and Eriana-3 to join their mission to destroy the Hive god Crota, Son of Oryx, alongside the Warlock Toland, the Shattered, the Hunter Sai Mota, and the Titan Vell Tarlowe. He accepted their invitation and traveled to the Moon with them.
The fireteam landed on the Moon and began heading for the entrance to the Temple of Crota while questioning Toland about the exalted Hive warriors they would be facing. Omar questioned what made the Blades of Crota so special, and Toland called them world-carvers whose swords had a dark edge and purpose. Omar reflected that their swords had cut down more Guardians than he could count during The Great Disaster and wondered if they were prepared to face the Hive alone. Vell claimed he was prepared, but Omar noted that did not answer his question. When Eriana and Vell both expressed interest in wielding the Hive's own swords against them and Vell thought they would be lucky to do so, Omar told him his ideas about luck were strange. Toland told Omar that he might think differently if he was forced to wield one for himself. They then discussed Sardon, Fist of Crota, and Vell declared that the Hive general sounded like his kind of fight, causing Omar to question if there was a fight the Titan would not enjoy.
After entering the Temple of Crota the fireteam heard screams from deep within the Hive tunnels. When the screams began again, Eris pointed them out, and Omar sarcastically claimed that he had just started to tune them out. Toland explained the screams came from Omnigul, Will of Crota, who was announcing the birth of new Hive spawn that served Crota. As the mad Warlock continued to ramble about the screams, Omar commented that he was on a roll, but he did reveal that killing Omnigul would end Crota's threat in the physical world, causing the fireteam to follow the screams deeper in the tunnels. As they hunted for Omnigul, the fireteam suffered their first casualty when Vell was overwhelmed by a swarm of Thrall that drained his Light.
After Vell's death the fireteam was split up, with Omar, Eris, and Toland becoming separated from Eriana and Sai. When Eris commented that she could feel something watching them, Omar commented that he hated when she said stuff like that. Toland revealed that their watchers were the Eyes of Crota, and Omar wondered how they could succeed if they were constantly being watched. Toland informed him that he was sure the Hive had led them there on purpose and that they would be used as sacrifices by giving their draining Light to Crota. Omar declared the old Warlock to be mad, but Toland merely agreed he might be right before directing Omar and Eris to hunt the eyes, kill them, and they could then following their draining Light to Crota.
During another encounter against the Hive, Omar was badly wounded and captured by the Heart of Crota and believed by Eris to be dead. The Wizard brought him deep into the Hive's tunnels to a chamber holding thousands of cocoons and freshly born Hive and held the broken Guardian in a vice of bone and pain, at which point she began to use Hive magic to peel his Light away. Screaming in agony, Omar's pain and Light were used by the Heart of Crota to feed the newly born Hive creatures, and his screams drew Eris to the chamber, where she witnessed his demise.
Years after his original death, Omar Agah reawoke in the Light's presence, having learned that a mishap in the Heart's ritual had extracted not only his Light, but his very soul. Having been transferred into the body of an insect-like creature from the Heart's experiments, Omar's new form was eventually recovered by The Guardian and reunited with Eris, whom infused his new form into the frame of his prized machine gun to create the Xenophage.
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