Powerful demon warrior with imposing horns and glowing eyes, wielding a massive obsidian sword adorned with ancient runes. Muscular physique covered in dark, leathery scales, exuding an aura of malevolence. Engulfed in swirling dark energy, casting ominous shadows. Background features a desolate battlefield strewn with wreckage and eerie, flickering flames. Intense, fiery color palette with deep reds, blacks, and smoky grays. Dramatic lighting accentuates the warrior's menacing presence. (Medium: Digital illustration, Style: Dark fantasy, Artist: Brom, Resolution: Highly detailed and sharp focus, Color: Fiery reds, blacks, and grays, Lighting: Dramatic