Create an ultra-photorealistic premium cinematic dark fantasy horror poster in a vertical 9:16 composition. On a stormy, rain-soaked night, a terrifying gigantic werewolf with wet black fur, glowing amber eyes, razor-sharp claws and exposed fangs emerges aggressively from jagged rocks in the foreground. Beside it stands the Grim Reaper, a skeletal figure wearing a long, shredded black hooded cloak and holding an enormous weathered steel scythe. Surround them with grotesque undead creatures, sinister horned demons, skeletal monsters and mysterious predatory silhouettes with glowing eyes hidden deep in the darkness. In the background, a ruined Gothic castle towers above sheer cliffs and waterfalls, illuminated by scattered orange firelight beneath a huge ghostly full moon. Lightning splits the dark storm clouds. Heavy diagonal rainfall, rolling ground fog, wet reflective rocks, ancient bones, dead trees and deep ravines create a hostile, terrifying atmosphere. Low-angle cinematic perspective, dramatic depth, highly realistic creature anatomy and fur, intricate textures, deep blue-black and charcoal color palette, subtle amber eye glows, volumetric lighting, extreme detail, atmospheric perspective, professional Hollywood horror poster quality, 8K aesthetic. No text, no logos.