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He commanded the [[ImperiumImperial]]'s forces that defended the [[Nephilim SectorSzabryne System]]'s in the [[Szabryne SystemNephilim Sector]], when it was invaded just as the [[Necrons]]' [[Nephilim Anomaly]] neared the system. The subsequent [[Szabryne War|subsequent war]], saw Castigane face numerous [[Chaos]] and [[Xenos]] forces, which he led the system against. But despite the [[General]]'s efforts, Castigane could not defeat the invaders, no matter what plans or Imperial forces he launched against them. Instead, the Szabryne System was still embattled when the Nephilim Anomaly finally approached it.{{Fn|1}}  With hours left before the system was lost, Castigane gambled on a final attack, which he hoped would save the Imperials from the Anomaly's [[Stilling]] effect. This saw him unleash every Imperial force available to reclaim the [[Sermona Magnificat]], on the world [[Humilitas]]. The Magnificat had once been the centre of [[Ecclesiarchy|Imperial faith]] in the system, until Humilitas was claimed by a [[Genestealer Cult]] uprising. The General believed though, that if he could seize back the Magnificat from the Cult, then the Imperials would prove their worth to the [[Emperor]]. By doing so, Castigane hoped the Emperor would then protect them from the effects of the Stilling when the Anomaly finally struck the Szabryne System.{{Fn|1}}

*''Athnar Castigane III'' and the [[Szabryne War]] appeared in [[Games Workshop]]'s 2022 [[Grand Narrative]] campaign.{{Fn|1}}

*{{Endn|1}}: [https://archive.ph/G9FoE Warhammer Community: The Warhammer 40,000 Grand Narrative Is the Best Crusade Event in the World] ''(archived from [https://www.warhammer-community.com/en-gb/articles/vhdr90rV/the-warhammer-40000-grand-narrative-is-the-best-crusade-event-in-the-world/the original] 3 February 2023, last accessed 30 January 2026)'' - [https://web.archive.org/web/20230515000000*/https://www.warhammer-community.com/wp-content/uploads/2023/02/sKnjBqScWweQWCLl.pdf The Szabryne War] ''(archived from [https://www.warhammer-community.com/wp-content/uploads/2023/02/sKnjBqScWweQWCLl.pdfthe original] 3 February 2023, last accessed 5 February 2026)''