Caballero Corrompido y Demonio de Sombra

Vertical dark fantasy nightmare scene in a ruined gothic cathedral. A [female] holy knight with long tangled [blonde] hair is caught mid-struggle in ornate mirror-polished silver plate armor engraved with gold filigree, her face deliberately obscured by a soft square blur with no facial features. She lunges forward gripping an ornate longsword in her right hand, blade angled downward to the lower right. Looming behind her, fused to her back like a living cloak, is an enormous shadow demon with two massive curved black horns, glowing red eyes, a charred bark-like skull, and smoke pouring from its head and shoulders. Five prominent black tendrils entangle her: across her chest, around her waist, binding her sword arm, sweeping across the lower foreground, and curling from the left side like a claw. Cavernous decaying cathedral background with towering ribbed arches, thorny black roots, tattered red drapery, floating embers, ash, dense fog, and faint orange firelight. Cinematic low-angle shot, high contrast cold blue-gray moonlight against hot red demonic glow, wet metallic armor reflections, smoky volumetric lighting, dynamic motion, oppressive horror atmosphere.