Bannus is a high-ranking member of the Iron Hands Space Marine chapter. He was wounded in a Dark Eldar ambush and has since become entombed within a Venerable dreadnought. He is the Clan Leader of Clan Kaargul and sits on the Chapter's Clan Council.
In 935.M41, Bannus was severely wounded when Dark Eldar ambushed Clan Company Kaargul on the Industrial World of Kaladrone. Iron Father Blantar deemed the Captain's loss an unacceptable blow to the strength of the Chapter and mounted a counterattack to rescue him. Despite sustaining horrific damage, Blantar and the survivors of Clan Kaargul returned to Medusa with Bannus's shattered body, allowing him to become entombed within a Dreadnought.