Changes

|Founding Chapter=Unknown[[Ultramarines]]{{Fn|2}}

|Homeworld=Unknown[[Vitrea Mundi]]{{Fn|2}}|Fortress-Monastery=Unknown[[BasSilica]]{{Fn|2}}

They are currently Founded in a [[M35]] Marines Mordant fought with a numerous enemies of [[Imperium]]. In the last years of [[M41]] they fought with the [[Leviathan]] [[Hive Fleet]] where their [[Battle Barge]] ''[[Assiduous]]'' took a heavy battle damages and Marines Mordant had lost two [[Space Marine Company|companies]] of battle-brothers.{{Fn|2}} In the [[M41]] they were undergoing a hundred year penance [[Crusade]] through the [[Tempest Hippocrene]].{{Fn|1}} ==Elements of the Marines Mordant==*''Assiduous'' - Battle Barge{{Fn|2}}