The Betrayers of Pain are a warband of Chaos Space Marines of unknown origin. Almost nothing is known about them in current Imperial records.
The Betrayers of Pain wear corroded green-coloured Power Armour with purple trim and black, blasphemous sigils. Their helmet is sometimes also painted purple.
The Betrayers of Pain's warband iconography is a previously unknown blasphemous sigil of Chaos which resembles two curved scythe blades pointed in opposite directions, forming a circle centred on a field of green.
- White Dwarf 333 (UK), "Chaos Space Marines - Other Chaos Warbands," by Mark Harrison, pg. 28