The Crimson Scythes is one of the Loyalist Space Marine Chapters founded as part of the Astartes Praeses -- one of the 20 Chapters of Astartes mentioned in the ancient tome known as the Mythos Angelica Mortis that was created to defend the regions surrounding the Eye of Terror in the Segmentum Obscurus from the Forces of Chaos. The Crimson Scythes are of an unknown Founding and origin.
The Crimson Scythes' Chapter colours are not recorded in current Imperial records.
The Crimson Scythes' Chapter badge is not recorded in current Imperial records.
- Dark Creed (Novel) by Anthony Reynolds, pp. 29–30