The Amaterasu Flames are a powerful, jet-black fire that burns intensely with a supernatural aura. The flames should appear as a swirling mass of dark energy, with a slightly transparent, wispy texture that suggests both heat and movement. The edges of the flames should have a subtle purple or dark blue glow to emphasize their otherworldly origin. The flames are not uniform; they should have varying intensities, with some areas appearing denser and more opaque, while others are lighter and more ethereal. The overall shape should be dynamic, as if the flames are alive and constantly shifting, with sharp, jagged edges that give them a menacing appearance.