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Difference between revisions of "Compounding"
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-- Sazed{{book ref|tfe|epilogue}}
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When a [[Metalborn]] has Allomantic and Feruchemical abilities in the same metal, they may store an attribute inside of a [[metalmind]] and then Allomantically burn the power. This gives a supercharged burst of the Feruchemical attribute, rather than the typical Allomantic ability.{{book ref|aol|11}} For example, a [[Twinborn]] with both abilities in [[iron]] can store weight briefly in a metalmind and then burn the metalmind to draw out an order of magnitude more weight than was originally stored (instead of receiving the usual Pulling ability associated with the Allomantic burning of iron). Both [[Sazed]]{{book ref|tfe|epilogue}} and [[Waxillium Ladrian]]{{book ref|aol|11}} suggest that the Feruchemical power withdrawn is multiplied tenfold, but it is unclear how accurate this number is. This increase in power is probably due to Allomancy being end-positive, rather than end-neutral like [[Feruchemy]].
To understand the mechanics for this ability, one must first understand the differences between Allomancy and Feruchemy. Allomancy is considered an end-positive system, meaning power is drawn from an outside source--in this case, from [[Preservation]].{{epigraph ref|mb3|32}} Feruchemy is an end-neutral system, with the power for the magic being drawn directly from the magic user--the amount of [[Investiture]] drawn out of a metalmind is equal to, and limited by, the amount of Investiture that was stored in the first place. In both cases, the type of metal acts as a focus, determining the form in which the magic manifests.{{cite}} When Compounding is performed, the nature of the Investiture already stored in the metalmind determines the form taken by the magic--thus Feruchemical attributes are released.{{cite}} However, because the Allomancy is fueled by Preservation, the amount of Investiture released is amplified. It is as if a previously hand-powered device were hooked up to an electrical cord to provide greater power output.{{wob ref|851}}
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