The Black House is a faction created by Theodora (the Black Queen) after the death of Zoé. It represents the empress’s mourning and her pursuit of necromantic power.
Theodora claims the Black Book (a necronomicon) as the foundation of this new House. The faction has access to polar cities and dark magic (tattooed skins of ancient Mongols, nocturnal rituals). It implicitly opposes the five existing Houses (Red, Blue, Green, White, Yellow) as an unforeseen sixth faction.