Duralumin

Duralumin emerges in the Mistborn series as a rare, lightweight Allomantic alloy whose properties shift dramatically between its debut and its later refinement. Initially introduced as a secret ninth metal that amplifies concurrent Allomantic burns without independent effect, it later becomes a volatile catalyst capable of triggering explosive releases of power. Across the two books, duralumin transforms from a covert tool of subtle enhancement to a weaponized accelerant, reflecting the escalating stakes of the Final Empire's collapse.