The Silver Sons are a Chaos Space Marine warband that was formed by members of the Thousand Sons Traitor Legion who were exiled by their Primarch Magnus the Red for aiding in the disastrous sorcerous ritual called the Rubric of Ahriman.
The Silver Sons warband's colours are a dark blue with silver trim, not drastically different from their parent Legion. They are known to line their Power Armour with priceless metals that have been extracted from celestial objects. They believe this makes them one with the stars by bestowing upon them a measure of the cosmos' natural power.
The Silver Sons warband's badge is a stylised ebon-coloured Mark of Tzeentch centred on a field of dark blue and trimmed in silver.
- War Zone Fenris: Wrath of Magnus, pp. 134-135