Tin

A person burning tin gains enhanced senses. They can see farther and smell better, and their sense of touch becomes far more acute. This has the side effect of letting them pierce the mists, allowing them to see much farther at night than even their enhanced senses should have let them. A Misting who can burn tin is known as a Tineye.

 Mistborn: Book 1 - The Final Empire ARS ARCANUM