They will be part of a splinter fleet of the Indomitus Crusade, the Tempestus Crusade.

Acting as a driving force, the Night Owls advance into the Dominion in order to bring it back into compliance, reestablish contact with the missing chapters (Storm Riders, Phantom Blades and Imperial Sons) and to prevent both, Xenos and Chaos of claiming it for their own ends.

Inspired by the Nite Owls, a sub faction of the mandalorian Death Watch. Because of this, the Night Owls will be heavily Mandalorian themed, as well.

Descendants of the Ist Legiones Astartes, the Dark Angels.

Originating from a distant world, which once bore an outpost of the 1st during the Great Crusade and later the Horus Heresy. Now, 10.000 years later, its sons return home to reclaim their birthright.

More details will follow once I've finished their basic fluff.

Imagine a chapter with the following inspirations:

- Assassin's Creed Templars

- 18th century aka the Golden Age of Piracy and especially the Seven Years' War

- the British Empire

- Bernard Cornwell's Sharp series

- Kul Tiras from Warcraft

It's focusing on trade, rebuilding a small cluster of worlds and facing off several threats, etc.

This is basing on an idea about an entire Lost & Forgotten Legion, done by LordThorn.

As proud Sons of Russ, the Warbeasts were assigned as reinforcements for an ongoing war between the Adeptus Custodes and a warband of the Wolves' ancient nemesis, the Thousand Sons.