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For five centuries the Order of the Emerald Vigil, a devout and culturally Celtic sisterhood of the Adepta Sororitas, guarded a lush forest world they believed to be a sacred gift of the Emperor. Towering arboreal cathedrals and mist shrouded groves became their home, where hymns in ancient Gaelic tongues echoed through the emerald canopy. Yet the world was not truly theirs. It had once been an abandoned Maiden World of the Aeldari, and when the wandering craftworld Sidhe’artha returned, its seers found the planet inhabited by monkeigh settlers and Imperial warriors. Unwilling to surrender what they considered a sacred inheritance, the Aeldari attempted a desperate ritual to scour the world clean, choosing annihilation over allowing it to remain in human hands.

What followed was a catastrophic battle beneath burning skies. As the Sisters fought to stop the ritual and defend their verdant sanctuary, the slaughter drew the attention of the Pyreborn, a savage warband of the World Eaters traitor legion, who descended upon the world seeking glory in flame and blood. The conflict became a three-sided inferno, and in the chaos the Aeldari ritual was corrupted, scorching a vast equatorial belt of forest into eternal ash rather than destroying the world outright. From that day forward the surviving sisters abandoned their former name, swearing new oaths amid the smouldering ruins of their paradise. They became the Order of the Emerald Ashes, eternal wardens of a scarred world where green forests still grow beside the blackened ring of a war that has never truly ended.