Malatium
Malatium is an alloy of atium and gold.[1][2] The exact use is unclear; it allows an Allomancer to see either who another person was in the past, or who they could have become if they had made different choices. This metal is referred to in legend as the Eleventh Metal. It is described as being silvery white in color.[3]
Allomantic Use
Malatium acts as a counterpart to gold, in that it allows an Allomancer to see into another persons past.[4]
Feruchemical Use
Malatium, when used by a Feruchemist, has unknown properties.
Hemalurgic use
When used as a Hemalurgic spike, Malatium steals some unknown trait or quality.
Trivia
Malatium is different from other allomantic metals, in that when it (and presumably the other Atium alloys) is burned, it provides the power itself rather than drawing upon Preservation, since it is of Ruin. Plantilla:Annotation ref After becoming Harmony, Sazed thinks that legends about the "Eleventh Metal" were made up by Ruin in order to help Kelsier's crew kill the Lord Ruler. Sazed made such conclusions because even after becoming god, he didn't find any evidence of the existence of these legends before Kelsier's journey. In the story The Eleventh Metal, Kelsier discovers notes on malatium after he defeats Antillius Shezler. Given Shezler's questionable sanity and Ruin's ability to manipulate text, Ruin could easily have created these rumours himself, as part of his plan to escape his prison.