The Flawless Host is a Chaos Space Marine warband in the service of Slaanesh, and was once the 36th Grand Company of the Emperor's Children Traitor Legion, which did not retreat into the Eye of Terror like the rest of their Legion did at the end of the Horus Heresy but were forced back into realspace through Warp Storm Bloodfire. Autopsies conducted by the Tech-priests of the Adeptus Mechanicus on the corpses of slain Flawless Host warriors have confirmed that the Flawless Host uses an extreme amount of exotic combat stimulants in battle. Lead by the Slaaneshi Chaos Champion Eleaxus the Flawless, the Host has slowly grown a significant force of more than 6,000 Chaos Space Marines dedicated to the Prince of Pleasure, and they firmly believe, in line with the Emperor's Children's original conceptions of perfection, that all other Chaos Space Marines, including their former comrades among the Emperor's Children, are weak and that only the Flawless Host has truly achieved the perfection promised by Slaanesh.
The Flawless Host's Power Armour is painted pale pink. The right arm and shoulder plate, lower legs and backpack are painted ina purple flame-like pattern. The trim and warband insignia are painted black.
The Flawless Host warband's badge is similar to the sigil of the patron Chaos God Slaanesh, except that the lower part is a crescent instead of an orb, and the other end is a six pointed star.
- Codex: Space Marines (4th Edition), p. 20