A striking fantasy art image featuring a demonic warrior with red horns, wearing dark, metallic armor. The warrior has a pair of large, black feathered wings with tips glowing green. The armor is form-fitting, highlighting the warrior’s strong physique. The background is a dark, mystical forest with green glowing elements and ethereal light. The warrior’s long hair transitions from black to neon green. This intense and powerful character design is enhanced by the dramatic lighting and shadow effects.