Hemalurgy

In Brandon Sanderson's Mistborn series, magic is depicted as a supernatural force harnessed via three distinct disciplines, also known as the three Metallic Arts. They are Allomancy, Feruchemy and Hemalurgy. All three magic systems are based on metals which are used to grant specific abilities. Their power originates in the Shards Preservation and Ruin; the two god-like deities that are present in the Mistborn world.

In the Mistborn series, Allomancy is a predominantly genetic ability that allows a person to metabolize ("burn") metals, ingested by the Allomancer, for magical powers that can enhance physical and mental capacities. There are 16 metals that such Allomancers can use, with each metal granting a specific ability. In addition to these, there are two fictional metals, Atium and Lerasium that are the solid manifestation of the powers of Ruin and Preservation respectively. A person who is only able to burn one of the Allomantic metals is known as a Misting. Anyone who is naturally capable of burning all of the metals is called a Mistborn. In the first trilogy, only Mistings and Mistborn existed, although in the second series, interbreeding caused a new phenomena of people with one Allomantic and one Feruchemical ability, called Twinborn.

In The Well of Ascension and The Hero of Ages, it is revealed that Allomancy originates from the power of Preservation. There are three sources (or origins) of Allomantic abilities in the Mistborn world:

The Allomantic metals come in four groupings of four metals: Physical, Mental, Temporal, and Enhancement. Each of these four groupings have two base metals and their corresponding alloys, which in turn have a related ability that counteracts or balances the base metal. Each metal produces an internal or an external effect.

In addition to the basic Allomantic metals, there are two fictional "God metals": Atium and Lerasium and their alloys. Burning lerasium or its alloys can turn regular humans into Mistborn and Mistings respectively. Atium allows Allomancers to see into the future. In The Final Empire, an atium alloy called Malatium is revealed, which allows an Allomancer to look into the past.

...
Wikipedia