The Stronghold Key is a large, ornate key with a heavy, metallic construction, featuring intricate engravings of gothic motifs and a slightly weathered surface suggesting age and frequent use. Its bow is designed with a symmetrical, complex pattern resembling a crest or coat of arms, while the shaft is long and robust, tapering to a precise, angular bit. The key's dark iron material has a matte finish with subtle scratches and dents, indicating its history in unlocking the secrets of the stronghold.