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The Scadrians know that you can become a ghost. They have a god's word for it. Kelsier did it. That opens up a question. We have only the foreword, not the whole Historica. How precise has Sazeth been? Is it a matter of public record that Kelsier took a bath in liquid Investure? Kelsier's survival is a central feature of Scadrian culture. People have been thinking about it for centuries. It would strike me as extremely odd if nobody had ever tried to recreate the feat or communicate with somebody trying to do so or the recently dead. That raises another question. How detailed have Spook's written records been? Has he talked about speaking to Kelsier after spiking himself? So what could you do to talk to the dead? If Spook's example is known, an obvious option would be to spike yourself multiple times. How many Pathian ear rings can you get into one person? Two dozen? Secondly if you need Investiture in huge amounts, how could you do that? Imagine a Nicrosil Twinborn. Suppose you are one and feel death approaching. You have prepared. You have spent a few weeks compounding. And now you take all your metalminds and ask your Nicroburst friend to give it to you just as you expire. What will happen?

Ok, so, bit of explanation up front about the long-winded topic tile. My first ever post on the forums was a Reverse Compounding theory (based on the WoB of there being "a way to enhance allomancy using feruchemy" (see following spoiler for the wob). In it, I went over how Compounding F-Nicrosil charged with an allomantic power would likely result in being able to become vastly stronger with that metal, which I still believe is true. I do NOT, however, still believe that to be "real" Reverse Compounding. It does involve using Feruchemy to enhance Allomancy, as per the Wob, but I think there's a second possibility, one that isn't limited to Nicrosil Compounding. (Y'know what, from henceforth, I will use C-Nicrosil/gold/etc to denote Compounded metals. It's just quicker and more concise.) This second possibility is that a Compounder can store the Allomantic effect of their metal inside a Metalmind, charging it up with the allomantic power instead of the usual feruchemical attribute. There's a certain symmetrical simplicity to that which makes me think I'm on the right track. Now the main benefit here is that you can keep burning the metal and charging up the metalmind with it, and after you're done, you have a feruchemically-stored supply of Allomantic power. So now you can make use of Feruchemy's greatest feature and tap a HUGE amount of allomantic power out in a short burst, almost like a Duralumin burn. The obvious example would be Steel, wherein you can Push with potentially hundreds of times the normal force you can muster, possibly launching a coin at railgun-level speeds, or fling yourself high into the sky with one leap. Another advantage this has over A-Duralumin burns is that the exact amount of power you muster can be fine-tuned, meaning you can also be more subtle with, let's say Steel again, and easily hover using ground anchors without needing as much practice in managing your allomantic steel burn rate/power. Now the first argument I could see against this is "well if that's how it works, why haven't we seen it yet" and, well, I think the answer is kind of obvious. In the case of Miles, doing this was pointless. He doesn't need finesse or brute force with A-Gold, he needs F-Gold charge en-masse. It's also possible that it's just too tricky of a balancing act to do BOTH at once, and so he just focused on doing normal C-Gold since Reverse C-Gold is just as useless as unmodified A-Gold. The other part of the answer is, well, we HAVE. The Lord Ruler could soothe in a HUGE radius, with soul-crushing potency. He may have known about Nicrosil, and so may have used normal C-Nicrosil to boost up his potency in A-Brass, but I feel like something's missing there. Surely if he was constantly burning brass to do that, he would have to be constantly chugging Brass flakes or poking brass spikes (not hemalurgic ones) into himself to burn, which seems crude and clumsy. Surely he of all people would learn how to Reverse Compound, and that's how he Soothes in such a radius at such power at seemingly all hours of every day. He's using RC-Brass and tapping it constantly. In fact, he could actually still be consuming brass metal to Soothe with, but that Brass could be supercharged with Allomantic brass power, making it even more powerful when burned. At the very least, that would significantly reduce the interval at which he would need to burn Brass, which would make things a lot less obnoxious. Just fill a brass ring with A-Brass, and Reverse Compound it, then store it in a full-sized Brassmind. I dunno, I feel like this lines up really nicely, and the poetic symmetry of it literally being the reverse of normal Compounding makes it even more plausible to me. What do you think, though? Where did i slip up in my logic?

Hello All I was wondering what would happen if let's say I was a twinborn from Pewter allomancy and gold feruchemey. Would I be able to burn Pewter to increase my strength and then use that strength to fill my gold metal minds? Pretty much cheating and using the health granted to me by pewter instead of my own health to fill my gold metal minds. Essentially gaining all the benefits that a gold compounder would get but better in some ways as I do not have to burn any gold doing this. Though filling my metal minds would take longer. Or is that not possible at all and I cannot draw on the power of pewter to fill my metal mind and doing this will just draw on my own power to fill the mind which means I'll still be weak physically while the minds are filling though maybe not as weak as usual since I'm burning pewter but overall my feruchemy is still net-zero and I won't be able to be immortal or fill extreme amounts of health using pewter. I've listened to graphic audiobooks for all Mistborn main series and side stories so don't worry about spoilers. Sorry if the formatting of tags and the title is off, I'm new here and plan to be active way more once I finish the rest of the cosmere stories (only Emperor's soul, white sand and Arcanum stories left). It's just this question was left on my mind.

Welcome to the return of Letters from the Cosmere! After taking a year off to reflect on the series, I am starting off the new year with the return of the series that is near and dear to my heart. I hope you enjoy this new start was we explore Elsric’s thoughts on Iron and Steel. This is also the announcement of the official Letters from the Cosmere YouTube channel! This will be an archive of all previous Letters and the home of new episodes from here on out. Rather than a constant blend of different genera on my main channel, this will be the home of all Cosmere content from now on. If you like what you see I hope you will stick around. I can’t wait to rear your thoughts and comments. This episode’s transcript: In the discussions of Allomancy it is no secret that the manipulations of Iron and Steel are the first thing to come to mind when casually considering the subject. Allomancers launching themselves through the air on invisible lines of power, the pulling of weapons from the hands of warriors before they can make a move, these are the hallmarks of the External Physical allomantic powers. Traditional means of security and martial strength quickly fade into near uselessness in the face of such powers making those who can push or pull on metals incredibly valuable and dangerous. Yet I feel there are many fundamental misunderstandings by the general population of Scadrial and the greater Cosmere in regards to the actual nature and potential of these powers. Within the obscure records of the most powerful allomancers in the histories, we can understand that coin shooting and bounding across the sky is but the shallowest of potentials for these such practitioners. It is important to remember that the outward pushing and pulling of metal is still heavily bound into the realm of natural physics. The investiture converts metal into invisible forces most relatable to magnetism but with a far greater scale and reach. This connection is unique in the natural world for the allomancer who burns iron or steel can perceive the metaphysical connection formed between their core and the metal around them. This would be like being able to observe a line of power holding a moon in orbit around a planet, and yet is often spoken of only in its application for allomancers. This metaphysical sight might be a natural development of survival instincts for without a means to know where they can push, allomancers would be hard pressed to control their pushes and pulls in any reasonable way. The force of the push or pull seems to be locked toward the center of mass of the individual. Yet I am skeptical that this is set in stone. The great manipulators of metal have reported in personal journals or been quoted to say that they were not limited on applying these forces to the center of mass of the affected object. I supplant that if given enough time, masters of the art may be able to control the application of such forces on the source as well as the target metal. If this hypothesis is realized, the powers a majesty of learchers and coinshots can be further crafted into masterpieces. Imagine a trapezes artist who can control the swing, speed, and direction of every limb independently and at the same time. A Mistborn with this control could fall through a collapsing building and come out without a scratch. With such talents the art could become subtle, being able to move and adapt in quiet ways that teeter on the edge of my mind. Now imagine if we learned to infuse such precision into exterior sources, such as pulling metal toward a wall rather than ourselves, to grant a push to an ally, or to design machines and gadgets that operate without any physical interaction at all. With the power to expand beyond the body and the finite control of selection freedom and accuracy, the Cosmere itself would not be able to contain these forces. Of all the powers of Allomancy, Iron and Steel complement each other to a shocking degree. Most metal pairings like Tin and Pewter, Aluminum and Duralumin, or Bendalloy and Cadmium work in opposition of each other and effectively cancel or overlap each other. Steel and Iron are not like this at all. Instead, their opposite natures complement and enhance each other. It is the distinction in targets that makes this possible, although a formattable mind and instinct are critical to such balance. But the nature of the material bonds in relation to Iron and Steel is something else entirely. We have accounts that the lines that allow allomancers to see sources of metal can be refined into something greater. Inquisitors of the Final Empire reported seeing the world entirely made up of blue lines of Iron and steel at all times, allowing them far greater control over their pushes and pulls. As this sight gains greater potency the connection between allomancer and the wider Cosmere becomes more and more complex. Instead of only pure metals, they see the flakes of metal in solutions or hidden in the raw stones of the ground. Deeper still, there are stories of allomancers seeing metal in common everyday objects such as wood, water, or human bodies. I must wonder how deeply this goes? Is great power required to see this or could we eventually understand these secrets through reasoning and deduction? Many advancements in practical realmic theory derived from asking the right questions and expanding one’s understanding. But if this is true, then many if not all the objects we perceive in the Cosmere contain fundamental metal components, like alloys that blend from two unique metals into something completely new and unique from the parent components. Perhaps there is a great revelation here about the construction of the fundamental parts of the Cosmere. If studied, this could pave the way for understanding the physical and invested forces that govern all of Creation. As with many things involving the sister allomantic powers of ferochemi, Iron and Steel only lead to the terrifying combinations. The Mobility of Iron and Steel in Allomancy is already potent. But when paired with Ferochemy the results tend to be… explosive and majestic. Yet the true terror is in compounding. An Iron Twinborn is capable of manipulating weight in the extreme. Couple this with the ability to pull against that weight and the possibilities are staggering. If one’s range could be enhanced, I could imagine a fully realized Iron born could literally destroy worlds by pulling in celestial bodies from the empty space directly into the surface. And the power to destroy worlds pales in comparison to the power of a Twin Steel Compounder. These creatures would likely not even count as human anymore. The power to tap nie-unlimited feruchemical speed would mean the allomancer would be able to exist out of phase of reality. A world too slow to notice that they do or how they do it. Where they walk, destruction would follow as the very air would burn and quake from their passing. With the ground nothing more than an inconvenience and such terrible speed, they would be bound by nothing short of time itself. Yes, the only thing these demons cannot outrun is the passage of time on their bodies. As they increase their speed, time warps with them. As their speed increased, beyond the limits of what Feruchemy could normally account for, their time would actually lengthen. As they moved, time itself counters by accelerating in response. Only a little at first, but eventually the Steel Child would watch the years slip by in proportion to their perceived experience. This is advanced physical theory but I expect that a Steel Twinborn to be surprised that time seemed to slow down and speed up at the same time as their passing ripples the world around them. But at these speeds, the very stones themselves would likely shatter and the world with them. Should these extremes be achieved by a mortal we would likely not live long enough to understand what happened. While the risk is low at the moment, I fear for the future. Investiture often is limited in its strongest application by the lack of creative vision on the part of the wielder. Perhaps we should be happy with that fact, for I have walked upon the surface of worlds broken by men wielded Investiture before. We do not have so many homes to afford such terrible calamities to be evoked. By my, what a sight they would be to behold. Much like the Catacendre, the death of a planet can be as beautiful as it is terrible. And such things leave scars as deep as the worlds they wipe away. Elsric Thank you for your patience with this series and I hope you find it as thought-provoking as I did.

I have a quick question about compounding. We know from Miles Hundredlives that compounding metals exponentially increases your feruchemical abilities. Does this work in reverse? If I were a copper compounder would I be able to make really, really good copperclouds? What does this mean for steelpushing and ironpulling? Thanks! -Channelknight

So I was wondering what new resonances might occur if a Radiant from one order got a hold of a Honorblade of another Order could new resonances be discovered between surges . Then something dawned on me . We have seen something similar on screen and it didn’t require an Honorblade ; therefore it may be quite possible we may see something new in the future . When Dalinar and Shallan got together and made the map they were blending lightweaving and Tension perhaps . ( I’m really not sure what surge Dalinar was using ) but they did create a new resonance . This got me thinking Dalinar and Mullata or another Dustbringer could probably create complex statues , designs and statues to form architecture . Sounds boring ? Yeah probably .... but it lead me to Jasnah and shallan working together to blend lightweaving and transportation : they could send Holograms at a long distance ! How could this be useful ? Sending messages back and forth to someone in shadesmar . Sending messages from Thaylan city to Urithiru without using a spanreed. Long distance communication is always a good thing . Can anyone think of any cool effects from blending two surges ?

so the first trilogy Sazed and vin have a conversation when Vin tries to burn one of Sazed 's metal minds nad she could fell the stored Ferechemic power but could accses it because it had Identity linking it to Sazed. I recently read BoM and was thinking about unkeyed metalmind and I was wondering if it would be posible to burn an unkeyed metalmind and more or less become a compounder. I would apperciate any thoughts on this.

So I found this interesting WoB. Questioner What happens if you burn duralumin while Compounding? Brandon Sanderson Duralumin while Compounding. So, what duralumin does is it burns out of all of your metal in one burst. So it doesn't necessarily gain you power, it makes it all happen at the same time. The same thing would happen. Questioner Could you turn into a baby? Brandon Sanderson Oh, you could totally turn into a baby. That is within the power of using that, doing <health wrong>, yeah you could totally... You'd be really dangerous. Wth does it mean ? How could u turn into a baby by compounding gold. I know it stores like ur manifestation in space-time at the current moment and releases it back to recover from injuries by replacing ur current manifestation in space-time with ur old healthy , stored one . Your spiritual identity plays a role too. But I was under the impression that gold couldn't affect age . If it did , tlr would be running naked in luthadel ,drunk on joy. Tlr did know about duralumin right ?? So what does it mean ? Is it a joke ? A misquote ? Or is Lord Sanderson referring to some other metal ? Also yeah would happen if u burned duralumin while compounding atium ?

So you can store investiture in nicrosil right. So how does that work. 1). Does it only store the ability to use other magic systems ? Like suppose I'm a twinborn and I store the ability to burn steel in an unsealed metalminds ,while not burning the metal. So when someone else taps it , do they temororarily gain the ability to burn metal but have to actually metabolize metal to use it ? 2). Suppose I burn steel but instead of using the energy to push on steel , I store it inside the metalmind. Then when someone else taps it , would they gain the ability to push without actually burning the metal. Or do both methods work ? Also suppose I'm compounding. So if I store 1 Newton of steel pushing in the metalmind and I burn it, do I get access to 10 Newtons of pushing ?

Now what if someone were able to compound electrum and gain infinite access to determination. Would that be enough to gain multiple hemalurgic spikes and still maintain ur Autonomy ?

So could a brass compounder increase his body temperature to extreme levels without igniting himself , but igniting his surroundings ? I mean for example skimmers and iron compounders could increase thier weight exponentially and thier bodies wouldn't be crushed under thier own weight. Similarly do brass compounders or firesouls have resistance to thier own increased bodyheat. If so could they be like Firefight was supposed to be like in the reckoner series. ( I have only read Steelheart so please no spoilers on incendiary type epics if there are any , no spoilers about the other two books at all ). Like bullets would melt around them and stuff. That would be pretty cool. If that isn't possible , what about if the person would be a compounder in both gold and brass ? Say it's hemalurgy or result of breeding or whatever . Or oh right Tlr. If so , would the person actually undergo spontaneous human combustion but heal just as rapidly ? But wait wouldn't the metals or metalminds or spikes melt then , atleast the gold ones. Would they still be useful in the molten state ?

Hi everyone, I was wondering if any of you have come up with some cool twinborn ideas, or if you have favourite twinborn combo? One of my favourite combos is Feruchemical bendalloy and Allomantic pewter for longer and stronger pewter drags. Another one is something I saw somewhere named a "Catcher"- basically a twinborn with Feruchemical steel and Allomantic tin, essentially making a Daredevil on steroids or something like that. Anyways what are your ideas? Cheers!

So Wax infers from miles's constant compounding that it would be detrimental to him if he were to stop . What exactly would be the consequences ? We know intensive brass compounding can lead to heatstrokes and even death . But that's only if they compound brass too much. Miles doesn't seem to have a problem with that . Is Wax even correct in his deduction ? Will there be withdrawal effects and maybe permanent damage ? What about the other metals ? Even if there are negative effects , is it as bad as allomantic savanthood with respect to tin or pewter ?

I read that gold compounders could go without oxygen . Is it true ? If so , does it have any limitations ( apart from gold costing lots more than cadmium but then again it's era 2 and cadmium's still costly ) or does it make cadmium feruchemy or compounding completely redundant ? Even with cadmium cost going down ? Also if it's not true , why didn't anyone try to choke miles hundredlives ?

So, as we have seen with Rashek and Miles Hundred-lives, compounding is possible when a allomancer burns a feruchemical metalmind that they have the necessary identity to access. So far everyone we have seen was allomantically and feruchemically able in the same metal or all the metals. Since all of the Metallic Arts metals come in pairs of one element and one alloy containing that element, and metalminds are (in a non-magical sense) identical to uninvested chunks of the same metal, it is theoretically possible for a metalmind to be filled and then forged into it's paired metal. My question is if this metal were then allomantically burned by the same feruchemist that filled it prior to forging, would that allow feruchemical investiture to be accessed and with which power? As an example Wax Ladrian fills an ironmind with a significant amount of weight, he then takes the ironmind to a forge and has it forged into steel, he files the steel down and burns it. Would he have access to a compounded version of F-iron, or less likely F-steel? Tib

I was thinking about Awakening in the shower today and I wondered if a Nalthian compounding their own breath (using either Hemaspikes or Medallions) would have a difference at high heightenings compared to a normal person who has gathered many breaths from many people. The primary realmatic differences I can see right off the bat are: 1. The Breath will have only the Compounder's Identity, and Intent (unless using Preservation's Investiture to Compound it causes some weird overwriting/blending). 2. The breaths may resonate (not Resonance-resonate, but like, harmonize, but not Harmony-harmonize) with their matching Intent and Identity and constructively interfere. The effects of this are obviously unknown for now, but let's speculate. I feel like it would be easier to Awaken using compounded Breath because all of them share the Awakener's natural Intent (even if slightly muddied with Preservation's Investiture due to the nature of Compounding) so focusing their Intent into a Command would take less effort. The harmonization of the Breaths may also mean it takes fewer to reach certain Heightenings, or that those milestones have new or different properties. What do you all think?

Okay, so... First post. Yay. I won't waste your time with that though, cause I want to see if anyone agrees with me on this. So hopefully you know what Compounding is; when someone has the same metal in Allomancy and Feruchemy. They can Allomantically burn a charged metalmind to get "tenfold" the amount of power back out of it, using the End-positive nature of Allomancy to generate that extra Feruchemical aspect. So here's my theory on Reverse Compounding, where one would use Feruchemy to increase the amount of power you get out of burning a metal. STEP ONE: Be a Nicrosil Compounder. This can be done using Hemalurgy spikes, if needed. STEP TWO: Spike yourself with another allomantic metal. Preferably not Aluminum. STEP THREE: Charge the everloving heck out of your Nicrosilmind with your spiked Allomantic metal. STEP FOUR: COMPOUND THAT NICROSILMIND TO HECK. STEP FIVE: BURN THE HECK OUT OF THE CORRESPONDING METAL. STEP SIX: PROFIT. And that's the most basic form of Reverse Compounding! And yes... Reverse Compounding Duralumin with another metal alongside it would be even more insane. But we can discuss those scenarios together. P.S. A Fullborn/Full Compounder can do this with no spikes needed. So that's fun.

Does anybody know what would happen if Brass was compounded? Soothing and Heat don't seem to go together.

I have been thinking about the medallions lately, and the scene between Vin and Sazed where she tried to burn one of his metalminds crossed my mind. Is it possible for an allomancer to use a medallion to compound that particular metal even though they themselves aren't feruchemists? Kinda tagging onto that, could a twinborn compound an unkeyed metalmind made by another feruchemist? Is this as obviously yes as I assume or is there something I'm missing?

As we know, if a person has the ability to use the same metal both allomantically and feruchemically, then they can compound that metal (i.e. burn feruchemical storages to multiply the ability stored in the metalmind). So then my question is, would a more powerful allomancer gain more out of compounding than a weaker one? So, would a natural twinborn compound their feruchemical storages by a lesser multiplier than a feruchemist who had burned lerasium for example. In short, does allomantic strength affect compounding efficiency? I welcome your input.

As we know, TLR used compounded feruchemical atium to drastically increase his lifespan. As I've come to further understand the nature of compounding, I've begun to wonder whether he would ever have run out of age? Would he not be able to say, wear an atium ring, tap a fair amount of age from his existing atiumminds, fill said age directly into the ring, swallow the ring and burn it multiplying the amount stored, then rinse and repeat? This would theoretically give him unlimited age as long as he still had some age stored somewhere. If I've gotten anything wrong or my understanding of compounding is flawed, then please let me know. Otherwise, I welcome your thoughts.

So this just occurred to me, but... Mistings can use Feruchemy. Let me put it like this. If a Feruchemist made an unkeyed metalmind, a Misting would be able to burn that metalmind, if it was the same metal they burn normally. At first sight, you think, well duh, that's pretty obvious. But there are deeper applications to this. Mainly, that of a Nicroburst Misting. If you had a Mistborn with Nicrosil and Aluminum Feruchemy, you could create unkeyed metalminds that allow other types of Allomancy, that only a Nicroburst could burn. You could fill a metalmind with any Allomantic power and... Allomancy would power Feruchemy to power Allomancy. Basically a Nicroburst would have access to any Investiture that a Feruchemist created. And could unleash it tenfold.

Bands of mourning spoilers ^^

Do you think a Soulburst (nicrosil compounder) could store not just bare investiture but also a manifestation of said investiure, like for example would he/she be able to store a Gravitation lashing? Also do you think it would be possible for a Soulburst to convert between Investiture from different worlds, for example converting a Breath into Stormlight or something similar? Furthermore a compounder can effectively multiply a stored unit tenfold, so if a Soulburst can multiply Investiture, how will that effect the Shard which fuels the magic system, since the Investiture comes from it.

This forum is mainly a response to the thread entitled "Compounding Mechanics", posted by 18th Shard. Here is the link: http://www.17thshard.com/forum/topic/4633-compounding-mechanics/#comment-74496 In that post, 18th Shard theorizes about the mechanics of the magic system and proposes the following possible forms of compounding: Allomancy powering Feruchemy Feruchemy powering Allomancy Allomancy powering Hemalurgy Feruchemy powering Hemalurgy Hemalurgy powering Feruchemy Hemalurgy powering Allomancy This post will cover my personal opinions on the mechanics of these systems as well as the mechanics of the possible compounding types. Feel free to make comments on my theories, propose your own ideas, and mention anything that you believe that I missed. Check out the above link for the mechanics proposed by 18th Shard in his post. First, we have Allomancy powering Feruchemy, or what I call AlloFeru compounding. This type of compounding has been directly proven by the novel, and was used by the Lord Ruler in the first Mistborn novel as well as Miles Hundredlives from the Alloy of Law novel to gain feruchemical power 10x that of the amount stored inside a metalmind by burning it allomantically. I am going over this one because there were debates on how it works. Some people argue that allomancy is merely magnifying the feruchemical effect, but I don't think this is the case. I believe that the feruchemical charge is a filter for the investiture typically gained while burning a metal. So burning a metalmind gives you the same amount of power usually gained from allomantically burning a metal, but in the form of feruchemical power. Also, you only gain the feruchemical effect while burning a metalmind, none of the allomantic effects, so the feruchemical charge in essence creates a new allomantic metal that gives a feruchemical attribute. In a way, the steel without feruchemical charges already has a filter for the investiture, simply by being the right alloy to be an allomantic metal. Let's say, for example, that steel has an innate filter of 0.1 allomantic "charge" (steelpushing) per gram of steel. When burned, investiture is taken from the power of Preservation, and because of the end-positive nature of allomancy, the power is used through the filter, resulting in 10x the power of the filter, in this case 1 allomantic charge per gram. If I were to instead feruchemically invest that piece of steel with 1 feruchemical "charge" (speed) per gram, the steel would adopt the new filter instead, overwriting the original allomantic filter. However, allomancy is still end-positive, so when the steel with the feruchemical filter is burned, the investiture output still results in 10x the power of the filter, or 10 "charges" of speed per gram in this case. I believe the filters and charges for the metals has to do with how the metal views itself in the Cognitive Realm, but that gets into Realmatic Theory, and I am not very experienced in that subject. Next, Feruchemy powering Allomancy, or FeruAllo compounding, seems the most likely other than the already existing AlloFeru compounding. This is the type of compounding that I believe that the Lord Ruler used to drastically increase his Allomantic ability. The original idea proposed for FeruAllo compounding in the post is that you can burn an allomantic metal, then somehow store the allomantic ability in a metalmind instead of using it instantly. This would be beneficial so that the allomantic power could be tapped at much higher rates than possible with normal allomancy for greater power. The difficulty with this theory is that there is no known way to store allomantic power. The first theory presented on the forum argued that because AlloFeru compounding only required that a metalborn be a misting and a ferring in the same metal, the same should be true for FeruAllo compounding. They believed that a metal can store two things: both its feruchemical and allomantic powers. I do not personally support this theory because I feel that AlloFeru compounding works by using both the mechanics of Allomancy and Feruchemy, not by breaking those rules. In Allomancy, one can burn a specific metal and the investiture of Preservation gives them an ability, they are not burning a specific trait or ability, while in Feruchemy they are storing a trait, not a specific metal. So, AlloFeru compounding works because an allomancer can burn the metal independent of what feruchemical traits are attached to that metal, but FeruAllo compounding does not work this way because a feruchemist can only store the specific trait, they cannot store the allomantic abilities that can come from burning that metal. The second theory was that allomantic abilities could be burned and stored by a feruchemist in a nicrosilmind because nicrosil stores investiture. This seemed the most likely to me at first, but when Sanderson released BoM, nicrosil was used in a different way, though I suppose this method could still be possible using a metal with an unknown feruchemical ability (feruchemical lerasium?). The alternate theory that I came up with, which seems the most reasonable to me, has some BoM spoilers so... It is at this point that we get into the more complicated types of compounding, mostly due to the fact that Hemalurgy comes into play. The idea behind Allomancy powering Hemalurgy (AlloHema) is that an allomancer spikes someone to steal a trait from them, then burns that spike, giving the allomancer the stolen trait with increased power. The downside to this is that because the allomancer burns the spike, they gain the trait only as long as they are burning the spike. This theory is somewhat likely, but I believe that there is a slight problem. Similar to when an allomancer burns a metalmind that isn't theirs, the allomancer in this case may be locked out of the power within the spike because it isn't attuned to their spiritweb. The way I see it, there are two different ways to get around this. First, an allomancer could burn a hemalurgic spike that stole an ability from them. The problems with this are that they most likely died from having that part of their spiritweb ripped from the rest of them (though it is possible that they survived), and their spiritweb may not actually be attuned to the ability because that part of their spiritweb was stolen from them. This would also not be very beneficial to them. By burning that spike, they would get increased power for a short time, but as soon as the metal of the spike was gone, they would have lost that ability forever. The other way I see to bypass this is for an allomancer to steal the trait from another person, then spike themself so that the power in the spike is part of their spiritweb. Sanderson has mentioned before that inquisitors could have theoretically burned their eye spikes, but it would have been extremely painful and would have knocked them unconscious. It would most likely be painful because the inquisitor would be burning away part of their spiritweb, ripping it away from them, similar to the way that traits are stolen during Hemalurgy. However, if one could somehow find a way to get rid of or tolerate the pain, they would be able to access the trait given to them by the spike with increased power, even though it would only last as long as they burned the spike. However, it may be impossible to get over the pain, making this form of compounding basically useless. One interesting interaction I thought about was using this form of compounding with, for example, a steel spike granting allomantic steel. By burning the spike, you increase the allomantic power of your steel, which increases the power with which you burn the steel spike, increasing the power again, repeating over and over again almost instantly giving the user infinitely powerful steel allomancy. If this is possible, it would only be possible with metals that could grant their own allomantic ability, such as steel, bronze, aluminum (inert), atium, and one other unknown allomantic temporal metal (not gold- most likely cadmium). The possibilities with these metals (except aluminum) are all interesting; let me know what you think. Next is Feruchemy powering Hemalurgy (FeruHema), where you steal a hemalurgic attribute, then store the attribute in a metalmind to be able to tap at larger rates for greater power. There is a similar problem with this method of compounding as there was with the previous method, namely that the spike's power is not attuned to the compounder. So, similarly, the spike would have to be a trait that was stolen from you, or you would have to spike yourself with the stolen trait. The main debate for this type of compounding is whether feruchemical and hemalurgic charges can interact with each other. If they do, then a feruchemist should be able to directly tap the spike for the stolen trait. My main problem with this theory is that there is no limit to how much hemalurgic charge one can tap from the spike, and though it would probably be related to how powerful the victim was in the stolen trait, it doesn't seem likely that the charges would interact in this way because they are separate systems. My personal theory has spoilers again... Compounding types powered by Hemalurgy, HemaAllo and HemaFeru compounding, are... well... I think they are simpler than they appear. Actually, I believe that they have been used in the series already. The methods for these types of compounding as they were presented in the other post, I believe, are incorrect. Now, this is just a theory, so don't get upset, but compounding is the method of using one of the metallic arts to boost another, and the ideas for those two types of compounding in the post are only used to share investitures with others. For HemaFeru compounding, I believe that feruchemically storing an attribute into a spike would provide a filter, similar to how the feruchemical charge in AlloFeru compounding provided a filter for the power supplied through Allomancy. However, in this case the filter restricts what can be stored and gained during the hemalurgic process. So if I stored feruchemical speed in a spike, I would only be able to steal not only just feruchemical steel, but only my feruchemical steel because the feruchemical charge is attuned to my spiritweb. And, unless I stole my own feruchemical speed through Hemalurgy, I would not be able to steal an attribute from another person because of the filter. Either this is the case, or feruchemical and hemalurgic charges have no interaction with each other, in which case the spike would simply act as it normally would, stealing an attribute, not granting the other person feruchemical charges. For HemaAllo compounding, there is simply no way to store allomantic power in the spike. However, if there was a way, I believe that it would act in a similar way, creating a filter as the feruchemical charge did and having the same result. My theory is that these types of compounding are where you already have an investiture, for example allomantic bronze, and you spike someone and steal their allomantic bronze in order to boost your own allomantic bronze. Sound familiar? If this is the correct way to compound, then Vin was a compounder the entire time. The same goes with HemaFeru compounding, boosting feruchemical power by stealing the same attribute from another person. Its boring, I know, but I believe that it makes the most sense. I wanted to add a little note at the bottom here to suggest the idea that multiple forms of compounding could be used in conjunction with one another, for example AlloFeruAllo compounding, where one stores allomantic investiture, then burns the metalmind for even greater power (or AlloFeruAlloFeruAllo... compounding). There are other combinations that include hemalurgic compounding as well, but I will let you guys look into those on your own. I realize that some of the methods of compounding in this chapter did not follow the compounding rules presented on the forum, but I do not feel that renders these forms of compounding particularly impossible or unlikely. If you feel I have broken fundamental rule of a metallic art, let me know. Edit: If you stored Allomantic Nicrosil investiture in a nicrosilmind and compounded it, it may result in unlimited nicrosil power, and one could compound other nicrosilminds of other investitures to have unlimited power in those Investitures.