Nightmare Knight and Demon

Create a vertical dark fantasy nightmare scene in a ruined gothic cathedral: a {argument name="warrior gender" default="female"} holy knight with long tangled {argument name="hair color" default="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 while gripping one ornate longsword in her right hand, the blade angled down toward the lower right. Behind her looms one enormous shadow demon fused to her back like a living cloak, with two huge curved black horns, two glowing red eyes, a charred bark-like skull, and smoke spilling from its head and shoulders. Five prominent black tendrils wrap around the knight: one across her chest, one across her waist, one around her sword arm, one sweeping across the lower foreground, and one curling from the left side like a clawed arm. The background is one cavernous, decaying gothic cathedral interior with towering ribbed arches, thorny black roots, red drapery, ember sparks, ash, fog, and faint orange firelight in the shadows. Use a cinematic low-angle composition, ultra-detailed realistic fantasy concept art, high contrast cold blue-gray moonlight against hot red demonic glow, wet metallic reflections on armor, smoky volumetric lighting, dynamic motion, oppressive horror atmosphere, no text, no watermark.