The Angels of Defiance is a Loyalist Space Marine Chapter comprised entirely of Primaris Space Marines created from the lineage of the mysterious Dark Angels and raised during the Ultima Founding of 999.M41. These supreme transhuman warriors were created by order of Roboute Guilliman, the recently resurrected Primarch of the Ultramarines, who had tasked Archmagos Dominus Belisarius Cawl with crafting a legion of new transhuman warriors to serve as Humanity's last line of defence following the Horus Heresy. Even then, Guilliman foresaw a time of encroaching darkness when Chaos would threaten the galaxy itself. These gene-crafted warriors are intended to protect the Imperium of Man against the gathering darkness from Chaos, xenos and the myriad threats that threaten the Imperium on all sides. They were the key components of the resurrected Primarch's Indomitus Crusade to reclaim the galaxy for Mankind.
"He who endures, conquers." So spoke the Dark Angels' Primarch Lion El'Jonson at the height of the Great Crusade. The Primarch's legendary tenacity and his Legion's ability to bear great suffering to achieve victory is reborn with the new Primaris Chapter, the Angels of Defiance. Founded in the darkest hour, they have become a beacon of hope beneath the pall of despair, earning many commendations during the Indomitus Crusade.
Most of the Unforgiven Chapters follow the Dark Angels' pattern of organisation, making the Angels of Defiance partially Codex Astartes-compliant. This includes having formations similar to the elite Deathwing and the Ravenwing, although they are not named as such. While having performed admirably, none have garnered the recognition of their Dark Angels' counterparts. Like the Dark Angels, the Unforgiven Successor Chapters also have a clandestine group, known as the Inner Circle, that possess knowledge of the Fallen and of the true events that occurred on Caliban.
The Angels of Defiance wear quartered black and bone livery on their battle-plate. The Aquila or Imperialis on the chest guard is bone. The black squad specialty symbol is indicated on the right shoulder pauldron whilst the Chapter iconography is painted on the left shoulder guard. Squad designation is indicated by a black Low Gothic numeral stenciled on the centre of the squad specialty symbol. Company number is designated on the right poleyn (knee guard), utilising the same unique heraldry as that of their parent Chapter.
Veteran Angels of Defiance are commonly found wearing forest green hooded cloaks and tabards; this symbolises their shame over what the Fallen Angels had done near the end of the Great Crusade. These cloaks and hoods are primarily worn by Veteran Battle-Brothers and the Chapter's Inner Circle because they have learned enough about the Dark Angels' history, and thus their shame, prior to obtaining their rank within the Chapter.
The Angels of Defiance's Chapter badge is a stylised bone key, pointing upwards, and centred upon a field of black.
- Codex Adeptus Astartes - Dark Angels (8th Edition), pg. 19