Bilming Underground Caverns

Bilming Underground Caverns appears in Mistborn.

The Bilming Underground Caverns first appear in The Lost Metal as a vast subterranean network beneath the city of Bilming, serving as both a hidden refuge and a strategic battleground. Initially introduced as a mysterious, largely unexplored labyrinth, the caverns quickly become central to the conflict between the Set and the protagonists, transforming from a shadowy hideout into a site of explosive confrontation. Their evolution from a passive backdrop to an active participant in the story—complete with hidden laboratories, tunnels, and a climactic showdown—mirrors the escalating stakes of the series' final installment.