Create a dark and terrifying Halloween scene set in a dense forest under the light of the moon. Twisted, bare trees rise in the background, with shadows that seem to move. In the foreground, an old grave covered in moss and vines, with a cracked tombstone and names faded away. A dense fog creeps along the ground, and a black crow perches on the tombstone, watching with glowing eyes. In the distance, a ruined castle looms, dimly illuminated by beams of light breaking through the clouds. Add details of blood dripping from the tombstone and a faint sound of whispers in the air, creating an atmosphere of mystery and terror.