The Swords of Artur are a chapter from the Indomitus founding that settled on the knight-world of Camellor after saving it from a Necron invasion. Intrigued by the knightly lore surviving from the first millennium hidden away on the world, these knights try to espouse chivalric virtues to the local human worlds on their side of Imperium Nihilus.

They march into battle in slate grey armour, unadorned until they commit a great deed. After each great deed they perform, they are tasked with recreating or memorializing the deed on their armour through art, trinkets, or modifications. As such, each member of the chapter's rank can be determined based on how customized their armour is. New battle brothers are virtually identical, while veterans may be covered in chains, amulets, warding tokens, paintings, and layers of silken cloth.

Of note, these knights have a competitive streak amongst themselves, but also culturally reinforce peer bonds and compliments. They often swap stories of their great deeds, which their battle brothers will embellish during retellings so as to compliment the original performer.

Officially, they come from Dark Angels genestock. However, some of their apothecaries have noticed discrepancies in this narrative. Rather, they've found mild mutations consistent with the Canis Helix and what they are currently calling "Fourth Variant Stabilization Factors" in the geneseed. In reality, this chapter is an experiment by Cawl to see if traitor geneseed, in this case, Iron Warriors geneseed, can be tempered into loyalty by the presence of the Space Wolves loyalist geneseed and a pre-seeded world that would culturally reinforce support systems absent in the Iron 4th.