Olympus Thorakitai

El Olympus Thorakitai is a highly organized Chaos Cult devoted to Khorne. Unlike many cultist warbands, the Thorakitai fought as a disciplined army, similar in training and organization to the Imperial Guard. Originating as the personal army of the 8th Grand Battalion of the Iron Warriors, they quickly became a army of the 8th Grand Battalion of the Iron Warriors, and cause the people of the Imperium no small amount of suffering and woe.

History
El Olympus Thorakitai se formo originalmente como parte de los Selucid Thorakite,  Imperial Army regiments raised on Olympia during the Great Crusade. Sharing the same world as the Iron Warriors, the Thorakitai were used as auxiliary troops by Perturabo and followed the Iron Warriors into rebellion during the Horus Heresy. Grim-faced and disciplined, the Thorakitai they proved to survive even the Eye of Terror. During the civil war known as the Iron Dispute. The vast majority of the original soldiers in the service of the 8th Grand Battalion died in combat against the other contingent Iron Warriors enemies.

After the departure of the Eye of Terror, the 8th did not take long to group a contingent of warriors who longed to fight against the Empire. The Iron Warriors grouped these warriors into contingents that were renamed Olympus Thorakitai. What at first was an army of some 700,000 undisciplined warriors, used in massive assaults with the aim of testing enemy artillery positions and their firepower along with possible traps, just becoming regiments comprised of both highly-trained human troops and xenos mercenaries