Nemesis
GW canon
Summary
Second Founding Chapter descended from the 22nd Chapter of the Ultramarines Legion, specialised in Exterminatus.
Allegiance
Loyalists
Founding
Second Founding
Colours
Green with golden aquila; pauldron trim in company colour
Doctrine
Exterminatus operations; Nemesis Destroyers
Epoch
M30–M41
History
In the Great Crusade and the Horus Heresy the 22nd Chapter of the Ultramarines Legion was called Nemesis and specialised in Exterminatus; it kept two full Destroyer companies and a large Terran contingent, which Guilliman found too alien. It earned its name purging the Cancerai Nebula with the VIII Legion. Calth and the Underground War made it grimmer still. As Nemesis it fought in the Orphean War in 992.M41.
Notes
Two full Destroyer companies, rare in other Chapters; Guilliman preferred to keep them off the front line. Symbols are the scales and death's head of judgement. After Calth and the Underground War, more stoic and grim.
Additional Information
Founding, detail
Existed as the 22nd Chapter of the Ultramarines Legion already in the Great Crusade (M30-M31)
Sources
Lexicanum, article “Nemesis” (revision 742183, retrieved 25 Oct 2026): https://wh40k.lexicanum.com/wiki/Nemesis. Works cited there: Chapter Approved 2001; Imperial Armour Volume Twelve - The Fall of Orpheus; The Horus Heresy Book Five - Tempest; Roboute Guilliman: Lord of Ultramar (Novel).