Visualize a towering fortress carved from black obsidian, its sharp spires piercing the stormy sky. Dark clouds swirl ominously above, casting eerie shadows across the rugged landscape. Glowing runes engraved into the stone flicker with an otherworldly light, hinting at ancient magic. Surrounding the fortress, twisted trees and jagged rocks create a foreboding atmosphere, while a blood-red moon looms, illuminating the scene with a haunting glow.