Mistborn is a fantasy book about people with magical abilities called allomancers.
Allomancers "burn" (metabolize metals in the body for magical powers) ingested metals, thereby enhancing various physical and mental capacities.
A Cadmium allomancer is referred to as a pulser. An Allomancer burning cadmium can subtly pull on time in a bubble around them, stretching it and making time pass more slowly.