Cadmium
Cadmium is the external temporal pulling metal. An Allomancer burning cadmium is able to stretch time in a bubble around them, making it pass more slowly. Feruchemists can use cadmium to store breath, and when used as a Hemalurgic spike, cadmium steals an unknown quality.
Allomantic Use
A cadmium Misting is known as a Pulser. Burning cadmium pulls on time around the user, causing time to pass more slowly in a bubble around them. Events outside the bubble appear to move much faster to someone inside.[1] It is suspected that it works similarly to bendalloy.
When a time bubble is created, the area of the bubble stays stationary with respect to a moving object as long as the person creating it is stationed on an object large enough. For example, someone standing on a planet, which is quite massive, is still actually moving with the rotation of the planet, and the bubble moves with that person, but the bubble itself stays in the same place with respect to the planet. However, if the person who created a time bubble is on a small, moving object (or the person merely walks to the edge of the bubble), the person will be transported through the bubble, "popping" it.[2]
Feruchemical Use
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A cadmium Ferring is known as a Gasper. Cadmium is used to store breath. While storing breath, the Feruchemist must hyperventilate to keep his body oxygenated. Tapping a cadmiummind allows the user to go without breathing, or to introduce extra oxygen into their bloodstream.[1]
Hemalurgic Use
When used as a Hemalurgic spike, cadmium steals some unknown trait or quality.