The Obsidian Citadel

Night had shrouded this domain in deep shadow, yet my alchemical ambitions demanded immediate fortification. Stalking across the polished parquet, I encountered a monolithic barrier: a heavy iron hearth grate flanked by discarded obsidian briquettes. Suspecting foul enchantments, I approached cautiously and struck one jagged black lump with the toe of my boot. It did not detonate; instead, it left a profound mark of pure soot across my leather. Recognizing the raw power of this elemental carbon, I dragged three chunks together to form the bastion of my newly claimed fortress.