A menacing Nightmare Weaver emerges, its gaunt humanoid form shrouded in swirling, inky black mist that constantly churns around its silhouette. Two intensely glowing red eyes pierce through the darkness, fixed with an unsettling stare. Impossibly long, skeletal fingers extend outwards, tipped with razor-sharp claws. Whisper-thin tendrils of shadow unfurl from its body, writhing and twisting like dark smoke, enhancing its psychologically terrifying and dark horror aesthetic.