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== History ==
Feruchemy came into existence contemporaneously with the other Metallic Arts, [[Allomancy]] and [[Hemalurgy]], as a result of the interactions between the planet [[Scadrial]] and its [[Shard]]s, [[Preservation]] and [[Ruin]].{{wob ref|5269
During the Ascension of the Lord Ruler all living Feruchemists (although not those with recessive Feruchemical genes), with a few notable exceptions, were transformed into [[mistwraith]]s by [[Rashek]], a Terris herdsman and Feruchemist.{{epigraph ref|mb3|68}} Rashek, having discovered Allomancy and transformed himself into a Mistborn and claiming to be the [[Hero of Ages]], declared himself a god and launched a campaign to consolidate the world under his control. As part of this effort, Rashek instituted policies to heavily restrict the Terris people, which eventually grew into a breeding program designed to exterminate all genetic traces of Feruchemy. He did this specifically because he feared the prospect of the genes for Feruchemy intermixing with those of Allomancy and potentially creating a rival of comparable power to himself.{{book ref|mb1|epilogue}} Despite this, the Terris resistance worked tirelessly to thwart the efforts of Rashek, then known as the Lord Ruler, in a variety of ways, primarily by tricking the breeders into including people with hidden Feruchemical talents, in order to ensure their continuation in the population, and by creating the [[Keeper]]s, an order of Feruchemists dedicated to finding and securing knowledge from before the Lord Ruler's rise to power.{{book ref|mb1|22}}{{book ref|mb2|30}}
Following the death of the Lord Ruler and the [[Collapse]] of the [[Final Empire]], the [[Synod]], leaders of the Keepers and ''de facto'' ruling council of Terris, emerged from secrecy and the Keepers were dispatched across the Empire to teach the people about the knowledge they had preserved.{{book ref|mb2|7}} Unfortunately, this "victory" was relatively short-lived; about a year later, the [[Steel Inquisitor]]s, under the influence of Ruin, attacked and slaughtered the Synod and all but [[Sazed|one of the Keepers]], creating [[Hemalurgic]] spikes from them in the process to increase their own powers.{{book ref|mb2|56}}
After the [[Catacendre]], the surviving Terris began to interbreed with the general population. The genes for Feruchemy began to break apart, as a result of mixing with those for Allomancy. Whereas before people had either the ability to use all of the Feruchemical abilities or none of them, Ferrings, who could use only one (analogously to [[Misting]]s), began to appear.{{wob ref|4696
== Mechanics ==
Feruchemy is an end-neutral manifestation of Investiture that allows the user to convert certain attributes into Investiture and store them in metal that they are in physical contact with, and to later retrieve them from the metal. As an end-neutral art, Investiture is not gained from an outside source (as it is in end-postive arts) and Investiture is not permanently lost (as it is in end-negative arts).{{book ref|mb4|part=ars}} Ordinarily, when a Feruchemist is tapping an attribute at the same rate it was stored, they are able to get out exactly what they put in, for example if they store 50% of their strength for one hour they can tap that and be at 150% of their strength for one hour. However, if the Feruchemist taps at a greater rate, then some of attribute is lost, to facilitate the compression of the Investiture. This means that a Feruchemist who stores 50% of their strength for one hour might only be able to stay at 200% for 25 minutes, rather than a full half hour. The more a Feruchemist compresses the attribute, the more is lost.{{wob ref|6126
The type of metal determines what attribute can be stored within it. Pieces of metal that have been charged by Feruchemists are referred to as '''metalminds''' in general, or more specifically as the type of metal with an added "-mind" suffix. The act of charging, or Investing, a metalmind is referred to as '''storing''' and the act of retrieving the stored attribute is referred to as '''tapping'''.{{book ref|mb4|part=ars}}
A larger piece of metal will be able to store more of an attribute, but the scaling is not linear; there are certain thresholds of size where the amount of attribute that can be stored increases.{{wob ref|234
Ordinarily, a Feruchemist's stores are keyed to their [[Identity]] and are inaccessible to another Feruchemist. However, other Feruchemists can sense the presence of the original Feruchemist's stores.{{book ref|mb1|epilogue}}
====Unsealed Metalminds====
An '''unsealed metalmind''' is a special kind of metalmind that anyone can access.{{wob ref|2112
=== Interactions with Other Investitures ===
Like any Invested object, a metalmind resists Allomantic Ironpulls and Steelpushes. The strength of resistance is based on the level of Investiture stored in the metalmind. A metalmind with only a small amount of stored attribute might resist only slightly, whereas a fully charged metalmind will be effectively immune.{{book ref|mb5|7}}
It is theoretically possible to detect the use of Feruchemy using bronze Allomancy, as it can detect any kinetic Investiture, however it requires a "tweak" that is not currently known.{{wob ref|6113
====Hemalurgy====
A [[Hemalurgic]] spike can be used as a Feruchemical metalmind, much like how multiple Feruchemists can store in the same piece of metal, as the charges are stored in different parts of the metal.{{wob ref|4617
An individual who has Feruchemy as a result of a Hemalurgic spike can access the metalminds of the Feruchemist who was used to create the spike, as the spike contains enough of the original Feruchemist's Identity. If that spike is split and implanted into two different people, they would each be able to access the original Feruchemist's metalminds, but they would not be able to share metalminds as their own Identity would interfere.{{wob ref|872
It is possible to use gold Feruchemy in order to heal the damage caused by Hemalurgy, effectively replacing the piece of the [[Spiritweb]] that was stolen.{{wob ref|983
====Nightblood====
Tapping a metalmind is enough to fuel [[Nightblood]] while it is unsheathed.{{wob ref|8683
====Awakening====
If an aluminummind is filled, then Awakened with Nightblood-level investiture to give it sentience, the resulting object's personality would probably be influenced by the Feruchemist's Identity, but it would not be an identical copy of the Feruchemist's personality.{{wob ref
====Shardblades====
A fully charged metalmind would be enough to block, or at least resist, a blow from a [[Shardblade]].{{wob ref|3670
It is possible to use gold Feruchemy in order to heal the damage caused by a Shardblade, restoring function to a "severed" limb.{{wob ref|4111
== Known Feruchemists ==
==Development==
The earliest inspiration for Feruchemy dates to when Brandon was a teenager and had insomnia. He would lie awake at night and be really tired during the day, so he wished that he could store up his sleepiness so that he could be sleepy when he wanted to be sleepy.{{wob ref|8974
An early version of Feruchemy, then referred to as "Hemalurgy", appeared in [[Final Empire Prime|''Final Empire'' Prime]]. During the development of ''[[Mistborn: The Final Empire]]'', Brandon realized that Feruchemy would work very well as the magic system for Sazed and the Keepers, so he imported it into that novel and added the restriction of storing attributes in metal.{{annotation ref|mb1|chapter=22-1}}
The attributes stored in brass (warmth) and electrum (determination) were originally supposed to be reversed. By the time Brandon realized his mistake, brass storing warmth had already been canonized in released books. Brandon decided not to retcon this, citing the fact that Feruchemy operates on different principles than Allomancy.{{wob ref|5508
== Notes ==
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