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 '''Maxima Atavian'''{{Fn|4}} is a [[Space Marine Sergeant]] from the [[Ultramarines]]' 2nd Company, under [[Space Marine Captain|Captain]] [[Cato Sicarius]]. He commands one of the two [[Devastator Squad]]s assigned to the 2nd Company.{{Fn|1a}}

During the [[Assault on Black Reach]] in 855 [[M41]]{{Fn|1b}}, Squad Tirian were deployed to [[Black Reach]] with the rest of the Second Company against [[Waaagh!]] [[Zanzag]]. After the liberation of Ghospora Hive from the [[Ork]]s, the Titan Slayers accompanied Sicarius and the rest of the company to hunt down the [[Warboss]].{{Fn|2b}}