Harmonium

Type

Magic system

First appears

Book 4 · Ch. 13

Books

2

Harmonium emerges in the Mistborn series as a rare, silvery metallic substance whose true nature is only gradually revealed across the saga. Initially presented as an enigmatic material suspended in oil to prevent corrosion, it becomes central to the plot when its unique properties—glowing with internal light when heated and becoming pliable under electrical influence—are discovered. By the events of The Lost Metal, harmonium is recognized as a god-metal with immense potential, its properties hinting at deeper connections to the cosmere's fundamental forces and the balance between Preservation and Ruin.