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|Specialty=Unknown[[Exterminatus]] operations

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|4}} The 22nd was well known for its a patchwork of specialised units, most notably maintaining two full companies of the [[Destroyer]] squads rarely found in the other Chapters,{{fn|5b}} and had a large [[Terra|Terran]]contingent -born contingents resulting in a culture which [[Roboute Guilliman|Guilliman]] considered to too far removed from the rest of the Legion.{{fn|5b}} The Chapter earned their name during the purgation of abhuman 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.{{fn|4}} Guilliman viewed the Destroyers as an unpleasant necessity, keeping them off the front lines where possible and wide use expressing an intent to restructure the dedicated Destroyer companies of the Nemesis.{{fn|5a}} During the campaign against the [[orks]] of the [[Thoas]] 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]]' death, Guilliman appointed [[Eleon Iasus]], [[Space Marine DestroyerCaptain|DestroyersCaptain]]of the 166th Company, as his replacement as part of an effort to integrate Nemesis into the wider culture of the Legion. They {{fn|5b}} The Destroyer companies were frequently called on for eventually deployed from reserve in the final stages of the [[ExterminatusBattle of Thoas]] operations.{{Fnfn|45c}}

===Known Engagements===As Ultramarines 22nd "Nemesis" Chapter*[[M30]] - Purgation of the Cancerai Nebula{{fn|4}}*[[M30]] - [[Osiris Rebellion]]{{fn|5a}}*Late [[M30]] - [[Battle of Thoas]]{{fn|5a}}As Nemesis

*{{Endn|4}}: [[The Horus Heresy Book Five]] pgpgs.73, 81*5: [[Roboute Guilliman: Lord of Ultramar (Novel)]]**{{Endn|5a}}: Chapter One**{{Endn|5b}}: Chapter Two**{{Endn|5c}}: Chapter Seven**{{Endn|5d}}: Chapter Eight