Visualize a towering, dark fortress made entirely of shimmering obsidian, its sharp spires piercing the stormy sky. A vibrant sunset casts an ethereal glow on the fortress’s jagged surface, illuminating ancient runes carved deep into the stone. Surrounding the fortress, a swirling mist of shadows reveals glimpses of mythical creatures lurking, while a turbulent sea crashes against its darkened base, enhancing the sense of mystery and power.