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JordanCon 2016 ()
#1 Copy

Questioner

I have a question in regards to the soulstamps… When Shai is creating it she blows flakes off of it. Are those flakes able to be enchanted and do they have any power?

Brandon Sanderson

Do the flakes that Shai blows off the front of the soulstamp have any hidden power? The answer is, no. I'm sorry, nice theory. The blowing off is actually just related directly to my experience. Soulstamps come from--

I lived in Korea for two years as a Mormon missionary, and then I went back to Taiwan to visit because there's a huge Brandon Sanderson fan base in Taiwan. For those who don't know, what happened is the publisher who got The Emperor's Sou-- No, no, the publisher who got Mistborn in Taiwan, published it the same month or so that Hunger Games came out, and everyone who was looking for-- read The Hunger Games wanted something like it ended up buying Mistborn. So actually-- *laughter* It's one of those things over here, like The Maze Runner or one of these other YA dystopians are what took off in the kind of halo of The Hunger Games. Over there, Mistborn was in the halo of The Hunger Games. It actually sold about as well in Taiwan which is-- So we just sold tons of copies in Taiwan. So I went back and it was really fun-- by the way you can go to my timeline on Facebook and whatever, and here, people like to ask questions. A lot of the superfans like to have a question and things like that. There, the superfans like to get pictures. And so there are like 5,000 pictures of me and teenage schoolgirls *laughter over Brandon* just all over Facebook from that period. But I went and visited the palace museum.

And anyway, I remembered a time in Korea where I'd seen someone carving these and he would do a little of this and blow it off, do a little bit and blow it off. Kind of the old-school carver. Now most days it's actually-- they're actually made by machines. You load in a design, you lock in your little tojong into the machine, and it goes and it will carve it out to look like the little computer design. But you see occasionally old school people carving them hand-- That's why I made it do that, because I'd actually seen someone carving one. There is not supposed to be any hidden magical meaning, other than the fact the stone that they're using is a traditional type of stone, which may or may not have Invested properties.

Arcanum Unbounded Chicago signing ()
#2 Copy

Questioner

What if you Soulstamped a city?

Brandon Sanderson

Soulstaped a city... So if you're a really good Forger-- It is possible to do things like that, but it requires a lot of work and time. Just one thing to keep in mind with Soulstamps, and anything that does this, rewriting your spiritweb, right, like, requires Invesiture. A lot of Investiture. And so, for instance, what Shai can do is really cool, but what an Elantrian can do is gonna look a lot more dramatic, right? Shooting a column of fire, you would say "Which takes more power, making the wall have flowers on it or shooting a column of fire?" Making the wall have flowers takes way more Investiture. It's a lot easier to pull off some dramatic effects with others, but the actual changing of the soul and overwr-- ...So just keep in mind the extent-- This is why you don't see Shai Forge it so the whole building disappears. Right? And stuff like this. Which is not outside of reason for a couple of Elantrians with the right program to put into place. But I mean effectively-- They could blow it up, essentially, that's what they would do

Bystander

Make a new hole, rather than making one that has existed.

Brandon Sanderson

Yeah. Exactly. Do keep in mind, people like to ask, you've probably seen people ask, "Could I rewrite myself to be a Knight Radiant?" Right? WELL... There are certain things that you just-- you can't fake without enough energy that it becomes impractical. Usually what I use as an example to that is: Yes, we can turn hydrogen into gold, if we wanted to. Right? We can do that! It might take more energy than the earth creates in an entire year, but we can do that.

I get a lot of questions with this that I'm like "is it possible?" and I'm like "Guys, is it possible?" ...You should probably be like, "Is it possible, with reasonable amounts of energy provided by one Invested person".

General Reddit 2018 ()
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BipedSnowman

In theory, could you create weird structures or even alloys [with Forgery]?

Two scenarios: using Forging how you might use Soulcasting, such as turning something into wood, bending and carving it to make a new shape, then breaking the seal so it turns back into the original material without changing shape.

Second: Forging one metal into another, and forming an alloy to reduce operation costs. For example, tungsten has a melting point of about 3.5k C, but it's useful as part of a steel alloy for certain applications. Could you Forge it into, say, zinc, which has a melting point of about 500 C, create the steel, then turn it back into tungsten? Presumably the investiture would adjust the molecular structure so it acts as if it has been alloyed with tungsten originally too, otherwise the same process happening with food could be deadly.

Brandon Sanderson

Yes, this is in theory similar to Soulcasting. The difference is that a Forged object, upon "Forgetting" the rewriting to its spiritual nature is going to try to snap back and match what it "thinks" it should be like--which isn't going to lead to as much stability as Soulcasting, where the actual soul is changed. The object is going to try to get back to the way it "should" be, with varying results.

The reason the Lord Ruler aged hyper-quickly is related to this as well.

Oathbringer Chicago signing ()
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Questioner

So, most of your magic systems are limited to only a slight portion of the population. Is that a conscious decision? Are there any that are open to anybody?

Brandon Sanderson

Certainly, the Warbreaker magic is open to everybody, and that's part of what I was doing, was I wanted to contrast the other ones. And this is just because it makes for good storytelling, honestly. And when I do this, I'm doing it too much, I go the other way. That's why Sixth of the Dusk is open to everyone, that's why different things are done differently in the magics. But, really, when I'm working on the books, I'm like, "Well, we need something dramatic and cool." And I would argue that at least some of them, such as in Stormlight Archive, those are open to anybody if you can convince a spren. And you're sincere, right? And I like going that direction. Certainly, the kind of old standby of "you're born with it" is really easy. It's really, what we call in Sci-Fi/Fantasy "grokkable." You can instantly, kind of, get it. You're like, "All right, this is just like a talent. Some people are born with different talents. Makes sense." It doesn't take a lot of explanation, you don't have to worldbuild a ton up front. Where something like Stormlight, you gotta send a lot of worldbuilding words to explain how it happens, why it happens, things like that. But the trade-off is, it's in many ways more satisfying if you do it the other way. So, I do try to balance those. But sometimes those short-hands are very handy.

Questioner

Is Forgery?

Brandon Sanderson

Forgery is a Selish magic system, so it is birth-based, tied to location.

Worldbuilders AMA ()
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zotsandcrambles

Have we seen any soul-stamped objects in any of the non-Sel books?

Brandon Sanderson

For you to have seen this, someone would have to have cracked the issue with Sel magics losing power greatly when taken from the planet.

zotsandcrambles

Is this a feasible task for someone like Shai or Hoid? We know the Moon Scepter is a Rosetta stone, so the task seems less daunting, right?

Brandon Sanderson

The task is less daunting for certain. I don't want to say more, however, as I think the clues are there about Sel's magic, and I want to avoid saying too much.

zotsandcrambles

Thanks for taking the time (again) to answer me!

Brandon Sanderson

So, here's the thing. The problem with magic on Sel is not one people are looking at the right way. And I'm really loathe to dig into it more, because I won't be able to write the books set on the world for a few more years yet.

Already, great moments in upcoming books aren't going to be as powerful to the hardcore fans, as they'll know the answers already.

But your theory, while very cool, wouldn't work--and stems from you attacking the problem in the wrong way.

A Memory of Light Milford Signing ()
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Viper (paraphrased)

Aons look like Arelon; soulstamps look like MaiPon. Aons get weaker when you get further from Arelon, right? That's not just cause Elantris acts like a focus?

Brandon Sanderson (paraphrased)

That's right, it's based on distance. That's why there are no stamped objects in Elantris.

Viper (paraphrased)

So do soulstamps get weaker further from MaiPon? If you left Sel via Shadesmar and went to another planet, would the soulstamp stop working?

Brandon Sanderson (paraphrased)

That's correct.

Viper (paraphrased)

Could soulstamps be carved that used Arelon as a base form instead of MaiPon?

Brandon Sanderson (paraphrased)

That's very interesting, isn't it?

Skyward Seattle signing ()
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coltonx9

If you were to [Forge] a car to say, that car had parked in a different space in parking lot what would happen, would it just disappear, if there were no other spots?

Brandon Sanderson

Okay, so you [Forge] the whole parking lot--

coltonx9

No, just SoulForge a car, in the parking lot to say it parked somewhere else.

Brandon Sanderson

That sort of temporal thing is probably not going to be something you can make work very easily with [Forgery]. You could rewrite this car so it had parked in that spot yesterday, but it's not going to change where it is, most cases. I think you might be able to contrive something that would work out, but that's normally not going to work... You can cause paradoxes with this sort of magic, that I have worked my best to make just not work.

/r/books AMA 2015 ()
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Nazrax

Can Forgery rewrite someone's gender (after all, it's just swapping out an X for a Y ...)?

Brandon Sanderson

Forgery could do this, but it is a tad bigger a change than you imply. Think of it this way: It's much easier for the magic to pretend that a table was cleaned up and polished than it is for the magic to pretend the wood used to make the table instead was used to make a chair.

Dragonsteel Mini-Con 2021 ()
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Aneesh

If there's a Forger like Shai who plausibly had an opportunity to ingest lerasium and become Mistborn, but she passed it up, could she create a stamp that makes her temporarily a Mistborn?

Brandon Sanderson

She would have to have access to enough Investiture to make that happen. The stamp saying, "Hey, I'm a Mistborn!" doesn't actually give her the Investiture to do that. She could rewrite her past so that she took that bead. She would not actually be able to use the power, until she got an infusion of Investiture, which could be done with a stamp in the right manner, but most of the time you're gonna have to have some external source. Basically you're gonna have to take a hit of Investiture, a large amount of it, and then use the stamp, and then it will feed on that to change you into basically any of the other magics.

Aneesh

Stormlight?

Brandon Sanderson

If you could get a hit of Stormlight, that'd work. The problem is, Stormlight's not easy to get off of Roshar, and it still is technically keyed. You could get it a lot more easily-- Stormlight would work fairly well, but what you really want is some pure, unkeyed Dor. That stuff, you could do all kinds of things with. But, you know, it's kinda dangerous. But that's the stuff you're gonna want, or something like unto it.

Legion Release Party ()
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Questioner

I notice that the two most complicated Investiture systems that we know of, those being Hemalurgy and Forging, are both the Investitures of Shards whose names have a generally negative connotation. Is there any correlation?

Brandon Sanderson

I would say that is not an intentional correlation.

Questioner

That is just a coincidence?

Brandon Sanderson

Yes.

JordanCon 2021 ()
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thegatorgirl00

Assuming they have the same years of practice, who would have a better understanding of objects' souls: a Radiant Soulcaster or a Forger? 

Brandon Sanderson

It's gonna depend on the individual, I think that they both could make an argument, and I'm not sure. I think it's gonna go neck-and-neck. 

Firefight San Francisco signing ()
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Silver

If you created a Forgery where someone was killed, would that person stay dead or would they wake up when the stamp wore off?

Brandon Sanderson

Umm ok. So you, in order to kill them, would have to Forge them to death, right. You can't just like-- for instance, if you rewrote this table so for whatever reason it believed that I was dead, it wouldn't affect me at all, it would only affect the table, because if you rewrote the table to believe it had been carved a certain way and I was the carver, I wouldn't remember doing that. So the Forgery affects only the item. If you stuck a stamp on me that forged me to be dead, I think that would probably be-- Depends on what you do to me, but it could go either way.

Questioner 2

It would have to be be believable wouldn't it?

Brandon Sanderson

Yeah it would have to be believable, but it could go either way. Depending on how you created it, and what was going on. It's a good question.

Silver

I did not come up with it!

Brandon Sanderson

Yeah, it is a good question... That could create some interesting paradoxes also.

Firefight release party ()
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Lady Radagu

If Shai were to gain a Shardblade and she gave it up, could she then create an Essence Mark that represented the history where she still had the blade? And then if she applied it could she summon the blade? Or a copy of it?

Brandon Sanderson

Okay, so doing that sort of thing, like re-writing herself to be an Allomancer or something like this -- This is possible but in order to gain the Investiture she wants to have she will have to input that much in Investiture which her current magic system is not capable of doing. Okay? Alright, so "re-write so that I have a Shardblade" would require some sort of hacking of her magic system, which is currently impossible to her in her current situation.

Lady Radagu

So if she had had a Shardblade and gave it up she could not rewrite herself to have that back without more input --

Brandon Sanderson

She could-- Yes, exactly. Now rewriting-- That would be a lot easier than just rewriting herself so that she had a Shardblade--

Lady Radagu

That's what I was asking--

Brandon Sanderson

Yeah, but what you're asking about would be much easier and that is probably within her power. But what that would do is-- Yeah that's totally within her power. It would create some weird implications where she's summoning it and someone summons it back from her because the Shardblade thinks it's owned by two people.

Lady Radagu

So it wouldn't be a copy it would be the same Blade?

Brandon Sanderson

Yes.

Chris King interview ()
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Chris King

Is Resealing a subset of Forging, or a separate system like Bloodsealing is?

Brandon Sanderson

Um...

*Looooong silence*

I'm trying to remember what I decided—I was building all of this on a fourteen hour plane flight, keep in mind—I believe it is—Let's go ahead and PAFO that one. I need to go to my notes. I can give you a tentative "I believe it is the same system and not a cousin system" but at the end of the day I kind of had to go to my notes and work things out. There was lots of wiggle room built into the Elantris magic systems but I have to know what I decided.

Calamity release party ()
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Questioner

Could a Forger, like, reforge a Shardplate to look differently?

Brandon Sanderson

So here's the thing... Um, yes, *but*... Anything that is Invested is-- resists all of the forms of Investiture. And the level of Investiture in it determines how hard it is. Forging is one of these things that-- It's very hard to reforge things that are Invested. Not impossible though. So yes, *but*... Do you see what I'm saying? There's that-- there's a pretty significant "but" on that one.

Shadows of Self Chicago signing ()
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Questioner

Could you Forge an entire human? What if a kandra eats that human?

Brandon Sanderson

Yes, you could Forge an entire human, and the kandra can eat that human as long as the Forgery takes. The problem is, once you break the seal, they're going to change back. So that kandra would have to find a way to eat that person without breaking the Forgery. In that case it would just remain.

Starsight Release Party ()
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Questioner

If a Mistborn were to burn a metal that's been Forged by a Soulstamp, is there a different effect from another, or?

Brandon Sanderson

So they Forged it from one metal into another metal?

Questioner

Yes.

Brandon Sanderson

So once they started to burn it, it would break the Forgery and it would turn back into its original metal. So you'd have just the briefest moment of getting what it said it was and then it would go back to the other and then if you were a Misting of the wrong type, you would get no more from it.

Questioner

What about Feruchemy or Hemalurgy?

Brandon Sanderson

So Feruchemy and Hemalurgy. You would have a lot of trouble Investing it because it's already Invested. So you would run into troubles right away trying to Invest it, because it's already got all the Investiture messing with it. You could theoretically make it happen, but it would take enough work and conniving that it just wouldn't be worth it.

Shadows of Self Chicago signing ()
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Questioner

If an Allomancer ate a Forged metal, what happens?

Brandon Sanderson

If an Allomancer eats a Forged metal, there is going to be some Investiture in that Forged metal, but it's not going to be keyed the right way, so it'd be like eating a metalmind... If you're asking if the metal was Forged into a different type of metal, the Forgery will take and it will believe and... that's going to get really weird. I have not considered that. That's a "let me think about it." My instincts say that it's going to work like the metal it's become long enough to burn for a few minutes, and then that's going to break the Forgery, and it's going to snap out of it and become the other [original] metal. That’s my instinct, but I’ll have to think about it further. [...] It's going to be really hard to burn a metal that's Invested like that. The magics don't mix real well.

Kurkistan

Eh, you can burn metalminds.

Brandon Sanderson

Yeah, you can, but it’s from the same "magic set", right? So...

General Reddit 2018 ()
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DTF_20170515

Why refrigerate food when you can just stamp spoiled food so that it was stored properly before?

Aurora_Fatalis

You'll have to ask Brandon how that'd interact with gastric acid breaking down the stamp. Or how porous/loose material interacts with stamps in the first place.

Come to think of it... There's a WoB saying the Nightwatcher could change your species, but have a hard time making a spren bond to you. So... could the Nightwatcher turn you Scadrian and make you eligible for Allomantic powers? Or does the Nightwatcher's boons operate on soulstamp principles?

Hell, let's say you bought a vial of the wrong metal on your field trip to Sel. Could you pay a Forger to stamp the vial into being a vial of the right metal (it's believable that you would check before such an important trip) and then drink the metal contained in the vial to fuel your Allomancy?

Brandon Sanderson

All right, all right. Let's see... /u/Aurora_Fatalis, changing metals around with other forms of Investiture is generally going to work, according to how I view the magic right now. The power is there, you just need to align the matter the right way. So forging new metals: not too difficult. This is because Allomancy isn't actually using Investiture in the metals, but using it as a key to get power from somewhere else.

Forging a sword to be a Shardblade, however, would be very, very difficult for multiple reasons. The most obvious one is that the Investiture required would be enormous. A Shardblade is a highly-Invested object, with its own self-aware soul.

If you could overcome the initial resistance invested objects have to being influenced by other magics (something that Forgery is particularly good at doing anyway) you'd theoretically be able to change Shardblade/spren's personality like you could a person's.

Fooling the magic via Connection and Identity is not so hard, under the right circumstances, so making a Forger into an Elantrian (or an Allomancer) for a short time is plausible. Making yourself into a Radiant, however, would be more difficult--because the limitations placed on that magic have to do with persuading a sapient being you are worth the bond.

Aurora_Fatalis

How about regular food? If I stamp a pineapple pizza into a pepperoni pizza and eat it, what nutrients do I end up with?

Brandon Sanderson

The way I have it working now, I believe (though I'd have to do some double-checking, as it's been a while since I've been working on Sel) soulstamps are more fragile than things like Aons, and it would be very hard to eat something with one without breaking it. But assuming you could, you'd get nutrients from what it had become--but those would change back once the stamp broke or ran out.

It is possible to go so far down this rabbit hole, however, that the chemistry of Forging (like the physics of Allomancy) it just can't make sense any more. So be aware.

Oversleep

With things like Stamping metals for Allomancy, you have said that it'd be possible for short time, but then burning it would break the Seal and metal would revert back.

I guess it would be similar with food, right?

Brandon Sanderson

Yes, that's the big problem with Forging. Getting the stamp to stay in place once you start to change the object that has been stamped.

Stormlight Three Update #4 ()
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argel1200

Regarding Ashraven... Would it be correct to say that memories are part of the mind/CR aspect? Assuming so, was Shai forging a new CR aspect to in-effect reconnect Ashraven's Soul (SR) with his body (PR)? I was thinking this could explain how she got his mannerisms correct -- i.e. that those are timeless SR aspects, so she didn't really get those right but instead, the SR connection was re-established?

Brandon Sanderson

Regarding Ashrovan: The problem here is that I don't want to get too deep into these sorts of things, for reasons that I want aspects of the magic to remain subject to discussion for a while yet. Suffice it to say that when we talk about Returned and lifeless in Warbreaker sequels, you'll have more ammunition for understanding what happened in Emperor's Soul.

Faera

Ashraven, Ashrovan...it's Ashravan damnit. He didn't step up to become emperor just so you could get his name wrong. Gaotona is ashamed of you all DX

Brandon Sanderson

In the original language, the a/o is very similar. I always get them mixed up in the English, like when I try to write aㅂsound from Korean in English.

Either that, or I just couldn't decide which one I wanted when writing the book, giving Peter a headache as he had to go back and standardize them all. :)

The Great American Read: Other Worlds with Brandon Sanderson ()
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Questioner

Soul Forging. Emperor's Soul. If one created the stamp properly, could you, using it, say, Windrunner you stamp, rewrote past to be Lightweaver. Possible?

Brandon Sanderson

That is possible and a little easier than a lot of other things. It's gonna run into problems... in that the Oaths are gonna be hard to align.

Questioner

Probably require some very fine crafting on the stamp.

Brandon Sanderson

Very fine crafting on the stamp. And there are certain people that they're just gonna have a hard time fitting into certain Orders. This is a lot easier though than just taking a random person and making them into one, because you're gonna already have Investiture that they've got.

Questioner

And have the basis of the First Oath.

Brandon Sanderson

Yeah. So this is not as hard as it might at first sound. It's the sort of thing that people in the cosmere are looking at. Like, being able to transfer magics between-- and things like that is one of very much interest in the cosmere.

Salt Lake City ComicCon 2017 ()
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Brightlord Maelstrom

Forged items. If it's one of those where it's permanent or it's not going to die after a couple of hours, can you move it off-world or would it transform once you moved it too far from its location?

Brandon Sanderson

Forgery requires a constant little stream of power to keep it going so yeah if you moved it off-world the Forgery's going to collapse.

Orem signing ()
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Questioner

If you were to Feruchemically drain your Identity, would you just be able to be soulstamped by any--  Would any soulstamp work on you?

Brandon Sanderson

Not the way I have it now. Because-- You're getting into stuff that I really would like to have my notes next to me for. So don't take this as too gospel. But the way I have this worked out right now, is if you drain your Identity, you still can't use Feruchemical metalminds that themselves have not been drained of Identity, right?

So, any old stamp still is going to be keyed to someone's past and Identity. So my instincts say no that would not work, but I have not worked out that specific interaction in the notes.

Shadows of Self Chicago signing ()
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Questioner

[In Forging], if you rewrite the history of an item, and it took effect permanently, would there ever be a potential to have a butterfly effect, out beyond the history of the item, that might directly affect something somewhere else in the world?

Brandon Sanderson

It would be very very hard for that to ever happen, because it's like spliced DNA or something like that. It's not real. It's a forgery. Nothing else considers it, that it did that. The only tricky bit would be if you have children, and you've rewritten yourself in an interesting way that’s actually changed your DNA, that... might have ramifications.

Skyward Pre-Release AMA ()
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MavenSoul

I'm wondering if Shai could create a stamp that would turn someone into an Allomancer. Or, alternatively, create a stamp that would break a bond between a Radiant and their Spren?

Brandon Sanderson

This is possible--but likely beyond Shai's ability. It would require large amounts of investiture. The second would be easier.

Skyward Atlanta signing ()
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Questioner

Would you be able to cure addiction with Forgery?

Brandon Sanderson

You could temporarily mask the symptoms of it, but I wouldn't call it being cured. You would also-- If you did something like the Emperor where you're constantly getting it renewed, the big danger is, since you haven't solved the problem at its core, falling back into it. But it's theoretically possible you could cover up the symptoms and have someone pull out of it that way.

Arcanum Unbounded Chicago signing ()
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Questioner

If you Soulstamp somebody to give them a Connection to Arelon, and they became an Elantrian, could they become and Elantrian, and if the Soulstamp is removed, would they remain?

Brandon Sanderson

Okay, so you're asking a better one than people have asked. So you say "You get Soulstamped, you move to Arelon, your soul thinks that it is this, you do have spiritweb of Connection" I will go ahead and RAFO this with the caveat of why it might not work, is because, you might think you’re something, right? That doesn't necessarily mean-- Like, this is not completely invisible and things like this. And so, whether the power is going to follow those lines of Connection or not I will leave up to discussion, but it is a possibility worth theorizing upon.

Questioner

So a Soulstamp doesn't necessarily change the core of your spiritweb.

Brandon Sanderson

It does, but it's overwriting it. It's like Hemalurgy. What you are is still there underneath when it's ripped away, right?

Calamity Seattle signing ()
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rani

Any kind of Investiture to make a Shardblade?

Brandon Sanderson

Not any but there are multiple methods.  Some work better than others.

rani

Can you Forge a Shardblade?

Brandon Sanderson

To Forge a Shardblade, meaning make a regular sword through Forgery into a Shardblade, would require so much Investiture it’s like asking if we can make lead into gold using a particle accelerator.  Yes but it's horribly, horribly, horribly inefficient.

Arcanum Unbounded Chicago signing ()
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Questioner

If you Stamp yourself, to have another, overwritten spiritweb, and you get Spiked-- *laughter* What would happen?

Brandon Sanderson

We actually worked this out. *laughter*

Questioner

Well, you'd die, or very close to it, but would it revert when the Stamp reverts?

Brandon Sanderson

So what’s probably going to happen here is that you’re going to rip off the Investiture you’ve put on your soul, and your own soul will have less damage. Now, the spike is only gonna get the-- the spike, you're like "What will it do?" It will do what you've been overwritten with, but again remember, becoming an Allomancer takes so much energy, and things like-- But it is theoretically possible in the cosmere to rewrite yourself "You're an allomancer", someone spikes you to get this. The Investiture doesn't care that it was fake on you, you have managed to get that Investiture to work. Uhh, this is really tough. And really, like, you need Connection, and you need, like, the right kind of Investiture, but then it rips off and yes you have made a spike that makes you an Allomancer, even though the person was a Forger. So yes, okay? But this is the kind of stuff that is like the thought experiments for physicists in the cosmere as opposed to, y'know--

JordanCon 2014 ()
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Trae Cooper (paraphrased)

Suppose you had a Feruchemist that was also skilled in Forgery. If they Soulstamped themselves, would they normally be able to still use Feruchemy, and if they were able to use Feruchemy after a Soulstamp would they be able to access their own metalminds?

Brandon Sanderson (paraphrased)

You could do so, but it would require jerry-rigging in order to make it work, since the Soulstamp overwrites the current Spiritual aspect of a person. He then said that the accessing the metalminds would also require some amount of jerry-rigging. 

/r/books AMA 2015 ()
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Kurkistan

Does Forging work by some kind of "procedural generation"? So Shai says "make me a stained glass window with a swirly pattern" and (assuming it's plausible) a window is "generated" without Shai having to go into exacting detail about its form? If so, what are the templates/guidelines that this generation is based off of?

Brandon Sanderson

It's somewhere between the two things you mention, and the guidelines are somewhat quantum in nature--meaning, what's the most likely pattern she'd have created if she'd actually gone about creating it.

Orem signing 2014 ()
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Questioner (paraphrased)

Could Shai Soul Forge herself into becoming an Elantrian?

Brandon Sanderson (paraphrased)

That would be really hard. First of all, she'd have to change where she's born, then Soul Forge the fact that she became an Elantrian. Even then, she'd probably look like an Elantrian, but not have any powers. There would probably need to be some kind of bridge, or she would need some kind of super push from AonDor to make it work.