The Flame Falcons were a Space Marine Chapter created during the Twenty First Founding and based on the world of Lethe. Like other Chapters of the Cursed Founding, the Flame Falcons suffered from mutations in their gene-seed - in this case resulting in their tendancy to spontaneously burst into flame during combat . The Chapter was declared Excommunicate Traitoris and driven from their home world by a force of Grey Knights thereby becoming one of the Renegade chapters.1
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Little is known about the Flame Falcons, except that they were declared Excommunicate Traitoris within a century of their creation. It is said during a campaign on Raffenburg's World, their largest battle yet, that members of the First Company, who were stationed at the front lines at the fiercest of the fighting, began to immolate. This did not harm the Space Marines, only their foes. The lines were reinforced and when news was reported back that the flames were helping the Space Marines, the commander thought it was a miracle, although he had already sent for an Inquisitor, fearing mutation.
The Inquisitor, however, had a different view. Eventually all of the Flame Falcons began to immolate and they began a celebration on their homeworld after the victorious campaign. The Inquisitor had called for the Grey Knights who came and destroyed the mutant marines. It is not known how many marines survived, but there have been sightings of immolated marines on more than one Imperial battlefield.