Chromium is the external enhancement pulling metal. An Allomancer burning chromium while touching another Allomancer will make their metal reserves vanish. Feruchemists can use chromium to store fortune, and when used as a Hemalurgic spike, chromium steals an unknown quality.
Allomantic Use
A chromium Misting is known as a Leecher. Chromium acts just like aluminum inside the body, causing enemy Allomancers touched by a Leecher to lose their metal reserves.[1]
Feruchemical Use
A chromium Ferring is known as a Spinner. Chromium is used to store fortune. A Feruchemist filling a chromiummind will be unlucky, and can tap it to increase his luck.[1]
Hemalurgic Use
When used as a Hemalurgic spike, chromium steals some unknown trait or quality.