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'''{{PAGENAME}}''' is an [[Ultramarines]] [[Primaris Space Marines|Primaris]] [[Chaplain]] who served in [[Lord Commander]] [[Guilliman]]'s [[Indomitus Crusade]]. {{Fn|1}} In his service to the Crusade, Dematris was part of [[Lieutenant (Space Marine)|Lieutenant]] [[Cassian]]'s Ultramarines strike force, which destroyed the [[Chaos Cults|flesh-cults]] that had overthrown the [[Imperium]]'s rule on [[Knossa]]. Afterwards, they left the world to rejoin the main forces of the Indomitus Crusade, but disaster struck when their [[Strike Cruiser]] [[Primarch's Sword]] was hit by a [[Warpstorm]]. Though the Strike Cruiser eventually escaped from the storm, it was left heavily damaged and the Ultramarines found themselves stranded in the '''[[Kalides System''']]. With the Primarch's Sword unable to enter the [[Warp]], Cassian consulted with Dematris and [[Librarian]] [[Keritraeus]] on their best course of action. After much consideration, it was decided they would go to the nearby Imperium world [[Kalides Prime]], so they could repair the Primarch's Sword and rejoin the Indomitus Crusade. Cassian also agreed with Dematris, that they might face a world in the grips of [[heresy]] and the Lieutenant ordered his forces to prepare for battle, as they began to travel to Kalides Prime.{{Fn|1}}