dark fantasy, high quality ultra detailed anime illustration, 1girl with very long flowing silver-white hair blowing in the wind, glowing red eyes, cold and fierce expression. she grips a katana with both hands, the blade emitting intense blood-red light and a long sweeping energy arc, like burning blood and lightning. she wears a deep red and black kimono-style cloak covered in eerie circular eye-like patterns and red crack veins, with a tattered white dress underneath. background is a shadowy forest / gothic ruins, a huge spiked blood-red halo or magic circle behind her against a stormy dark blue night sky. ground is dark, wet and cracked, scattered with pink cherry blossom petals and branches, petals drifting in the air. strong contrast lighting, cool blue ambient light mixed with vivid red sword glow, lots of sparks and particles, dramatic, ominous, epic atmosphere, no text, no watermark, anime style.