協助機械龍順利運作的核心零件。 需要精密加工，且只有匠人的技術才能修復，此珍貴的材料擔任複雜機械構造的心臟的重要角色。
A core component designed to let the Mechadragon move smoothly. It requires precise machining and demands skills only master craftsmen can handle. As a valuable material, it serves as the heart of a complex mechanical structure.