The Sons of Orar are a Codex Chapter of unknown origin. Though the history of the Sons of Orar has been lost, what is known is that they revere Orar, an Ultramarines Captain who won great renown in the wake of the Horus Heresy, and claim him as their spiritual patriarch.
The red omega chapter symbol is closely related to the Ultramarines symbol.
They appear to possess a large amount of Corvus-pattern power armor suits in their armory.
The chapter shares a name with the planet Orar, a Hive World in the Gothic Sector