Osandus
Osandus is a Fallen Librarian, who signed a blood-marked pact with Abaddon the Despoiler after the Black Legion's Warmaster helped him escape from the Dark Angels during the Pandorax Campaign. Sometime afterwards, Osandus traveled to the Imperial world Vigilus and met with other Fallen within the Citadel Vigilant, which was hidden within the center of the giant storm known as the Vhulian Swirl. The Citadel's remote and hostile location made it an ideal base for the Fallen, who had been using it as a staging ground to further their own agenda and to investigate Vigilus' true history. Osandus would become the leader of the Fallen there and used his psychic powers to ensure no one could locate the Citadel. However, its true prize was the ancient weapon known as the Voidclaw, which sat atop the Citadel's spine. After centuries of study, the Fallen discovered how to operate the Voidclaw, which when fired created a gravitic anomaly that could turn warships inside out. After forming a psychic rapport with the Voidclaw's malevolent weapon-sentience, Osandus began a plot that would allow him to use the weapon against the Dark Angels. This called for the Librarian to gather an army of Fallen upon Vigilus, and then allow the Dark Angels to learn of it from Fallen who allowed themselves to be captured by the Sons of the Lion.[1a]
By doing so, he hoped the Dark Angels would have no choice but to arrive in force with The Rock to investigate. Once they did so, Osandus planned on using the Voidclaw to destroy the Rock and deal a death blow to the Dark Angels. However, Abaddon the Despoiler became aware of the Voidclaw and once the Warmaster invaded Vigilus during the War of Beasts, he used Osandus' blood-marked pact to locate the Librarian's location within the Vhulian Swirl. He then teleported with the Bringers of Despair to the Citadel and met with an angered Osandus. The Despoiler then explained how he wanted to use the Voidclaw to destroy the Nachmund Gauntlet and ensure the Imperium was forever cut in half. Though Osandus had been reluctant to hear of Abaddon's plan, the idea of striking back at the entire Imperium was so compelling that the Librarian readily agreed to aid the Despoiler in his task. In order for that to happen though, the War of Beasts needed to end with Vigilus firmly in Abaddon's control. Now fully committed to the Despoiler's plan, Osandus agreed to Abaddon's demand that he fire the Voidclaw directly between Vigilus and its moon, Neo-vellum, which caused a giant gravitic anomaly to appear. The anomaly pulled directly at Vigilus and Neo-vellum's surfaces and wreaked havoc on the Imperium's forces. The Despoiler and his hordes then took advantage of the mayhem to launch further attacks on Vigilus, while Osandus and the Fallen remained within the Citadel[1a]. However, the gravitic anomaly also pulled at the Vhulian Swirl, which began to lose its strength as a result. With the Voidclaw continuing to fire into space, the giant storm soon dissipated and the Dark Angels taking part in the War of Beasts, who had long suspected the Fallen were hiding within the storm, were able to locate and attack the Citadel. Despite its defenses the Citadel fell to the Dark Angels, who then disabled the Voidclaw and brought an end to the giant gravitic anomaly. The Dark Angels left Vigilus soon afterwards and it is not known what happened to Osandus and the Fallen, as the Sons of the Lion had ensured no evidence of their existence remained within the Citadel.[1b]
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