The Ancient War, also referred by the later generations as the war of God-slaying(神殺しKamigoroshi, lit. "Deicide"), is a war between the Crimson God of Creation, the Snake of the Festival's faction consisting of his servants and dozens of Crimson Denizen, and the Ancient Flame Haze. It was the God of Creation's first attempt to create a world for Crimson Denizens in human world.