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During the [[Great Crusade]] and [[Horus Heresy]], the 22nd [[Chapter]] of the [[Ultramarines]] [[Legion]] was known as the '''Nemesis Chapter''', specialising in [[Exterminatus]] operations.{{Fn|4c}} The 22nd was a patchwork of specialised units, most notably maintaining two full companies of the [[Destroyer Marine|Destroyersquads]] squads rarely found in the other Chapters, and had a large [[Terra|Terran]] n contingent - resulting this resulted in a culture which [[Roboute Guilliman|Guilliman]] considered to too far removed from the rest of the Legion.{{fnFn|5b}}

The Chapter earned their name during the purgation of [[abhuman ]] [[Pirate|corsairs ]] in the [[Cancerai Nebula]] alongside the [[Night Lords|VIII Legion]]. As well as the name "Nemesis", they took to wearing black gauntlets, midnight blue helms and adopted the weighing scales and death's head icon of judgement.{{fnFn|4c}}

Guilliman viewed the Destroyers as an unpleasant necessity, keeping them off the front lines where possible and expressing an intent to restructure the dedicated Destroyer companies of the Nemesis.{{fnFn|5a}} During the campaign against the [[orksork]] s of the [[Thoas|Thoas Empire]] Empire, he kept the Destroyer companies in the void, hunting the orks on the barren moon of [[Agrigentum V]]. In the wake of [[Praetor (Rank)|Chapter Master]] [[Machon Phalaris|Phalaris's]]' death, Guilliman appointed [[Eleon Iasus]], [[Space Marine Captain|Captain]] of the [[166th Company (Ultramarines Legion)|166th Company]], as his replacement as part of an effort to integrate Nemesis into the wider culture of the Legion.{{fnFn|5b}} The Destroyer companies were eventually deployed from reserve in the final stages of the [[Battle of Thoas]].{{fnFn|5c}}

The Nemesis was only partially mustered at [[Calth]] as some of its companies were engaged alongside elements of the [[7th Chapter (Ultramarines Legion)|7th Chapter ]] reducing the [[Fra'al]] crucible worlds along the galactic rim.{{fnFn|4b}} Those companies able to make the journey to Calth were mustered in the highlands of [[Thracius ]] in order to distance them from population centres.{{fnFn|4c}}

*[[M30]] '''Purgation of the Cancerai Nebula'''{{fnFn|4c}}*'''833.M30''' [[Osiris Rebellion]]{{fnFn|5a}}*'''After 903.M30''' [[Battle of Thoas|Thoas Campaign]]{{fnFn|5a}}*'''007.M31 Reduction of [[Fra'al]] Crucible Worlds'''{{fnFn|4b}}*'''007.M31''' [[Battle of Calth]]{{fnFn|4c}}*'''997011.[[M31]]''' [[Battle of Desperation]]{{fnFn|6}}

*[[Machon Phalaris]] — [[Praetor (Rank)|Chapter Master]], killed by [[orksork]] s in the Ajetho [[Aletho System]].{{fnFn|5a}}*[[Eleon Iasus]] — Chapter Master.{{fnFn|5b}}*[[Laches ]] - Captain of the First [[Destroyer]] Company.{{fnFn|5b}}*[[Hierax ]] - Captain of the Second Destroyer Company.{{fnFn|5a}}*[[Sirras ]] - Captain of the 223rd Company.{{fnFn|5a}}*[[Lobon ]] - Captain.{{fnFn|5b}}*[[Laevius ]] - Dreadnought, Second Destroyers.{{fnFn|5d}}*[[Kletos]] — Legionary, Second Destroyers.{{fnFn|4c}}

===Chapter FleetSee also===*''[[Lex Talonis]]'' — [[Gloriana Class Battleship]]{{fn|4a}}*''Cavascor'' — [[Strike Cruiser]]{{fn|5b}}*''Glory of Fire'' — [[Frigate]]{{Fn|5b}} ==Related Articles===

*{{Endn|3}}: [[Imperial Armour Volume Twelve- The Fall of Orpheus]] , pg. 40

**{{Endn|4b}}: pgs.32-{{Cite this}}