The Lost Metal

The Lost Metal is the seventh book in the Mistborn series and the fourth in its Wax and Wayne subseries. New readers should begin with The Final Empire to fully appreciate the world-building and character development.

This novel is a significant entry in Sanderson's Cosmere universe, featuring explicit connections and character appearances that tie into the broader narrative of his other works, such as The Stormlight Archive and Elantris.

Yes. The Lost Metal is the fourth of four Era 2 books and resolves character arcs established across the entire sub-series.

The Lost Metal provides a definitive conclusion to the story of Waxillium Ladrian and Wayne, resolving their personal journeys and the overarching plotlines of the Mistborn Era 2 series.

It is the most overtly connected Era 2 book, with elements from other Cosmere works appearing directly. Readers who have read Tress of the Emerald Sea and Mistborn Era 1 will find additional context, but the essential plot is followable without it.

Yes — its ending is designed to set up the planned Era 3 Mistborn books, which will be set in Scadrial's sci-fi future rather than its current steampunk period.