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|Name={{PAGENAME}}
|Founding Chapter=[[Ultramarines]]{{Fn|2a}}
|Founding=Unknown
|Chapter Master=[[Tarro Pallidax]]{{Fn|2c}}
|Homeworld=[[Vitrea Mundi]]{{Fn|2a}}
==History==
Founded in a [[M35]] the Marines Mordant fought against a numerous enemies of [[Imperium]] including the [[Ork Empire of Octarius]]. In [[M41]] they were undergoing a hundred year penance [[Crusade]] through the [[Tempest Hippocrene]].{{Fn|1}} In the last years of [[M41]], during their fight against [[Hive Fleet]] [[Leviathan]], their [[Battle Barge]] ''[[Assiduous]]'' suffered serious battle damage and the Marines Mordant lost two [[Space Marine Company|companies]] of battle-brothers.{{Fn|2a}}
Later their homeworld of [[Vitrea Mundi]] fell victim to a force of [[Alpha Legion]] warbands under the command of [[Harrowmaster]] [[Quetzel Carthach]]. The Vitrea Mundi [[PDF]] revealed their treachery, unleashing a chemical attack that induced mass panic and bloated out the planet's sun. Chapter Master [[Tarro Pallidax]] agreed to open the gates of [[Fortress-Monastery]] [[Bas-Silica]] to help the panicking refugees, but this was a ruse by Alpha Legion forces who stormed the citadel. However the Marines inside lowered the [[Void Shield]]s of the Fortress, allowing the orbiting Battle Barge ''Assiduous'' to unleash a orbital bombardment that annihilated both sides.{{Fn|2c}}
