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Oathbringer release party ()
#1 Share

Questioner [PENDING REVIEW]

Where did you get the idea for the gemhearts.

Brandon Sanderson [PENDING REVIEW]

So, I wanted-- in the books, I wanted there to be an economic component to the magic, like, something that was based on the money in the world. And I knew I wanted to use the gemstones, but I also knew they would be used up really quickly by the magic, with Soulcasting. So, I built something into the creatures of the world, so that we could renew the gemstones, so they wouldn't all just be gone after a few hundred years.

Leipzig Book Fair ()
#3 Share

Questioner

I was wondering if the Chasmfiends have... like their own Gemhearts...

Brandon Sanderson

Yes.

Questioner

It's probably not a coincidence that emeralds that can hold most of the Stormlight. So are Chasmfiends, do they take energy from Stormlight?

Brandon Sanderson

Yes, yes, yes, yes. That's part.

Questioner

So there is a huge energy source there, they can supply it with eating so...

Brandon Sanderson

It is actually most beneficial during their metamorphisis, as you'll notice that the chrysalises are not as big as they get, and so yeah. They depend on the Stormlight and they depend on the Spren that they are bonded to keep them from crushing themselves. So Chasmfiends couldn't exist off world for multiple reasons.

Questioner

I'm guessing that for Chasmfiends the absorption of Stormlight is different because there is a whole shell thing that is thick.

Brandon Sanderson

Yup, yup.

Salt Lake ComicCon FanX 2016 ()
#5 Share

Questioner:

Is it only Greatshells that have gemhearts, or do all crustaceans on Roshar have some sort of gem inside? If it is only greatshells then are their unique decayspren related to this fact?

Brandon:

It's a matter of body chemistry. Not all crustaceans do have gemhearts, but most can, not just greatshells. It's a matter of their particular body chemistry that lets greatshells grow the larger gemhearts, which is what allows them to grow so large themselves.

Oathbringer London signing ()
#6 Share

Overlord Jebus [PENDING REVIEW]

So you've previously described gemhearts as Investiture leaking into the Physical Realm in a similar kind of process to atium. Now atium had a way of-- the Investiture used in the creation of it-- of returning back to the kind of background pool of Investiture on Scadrial. Is there a way of the Investiture used in the creation of gemhearts to return to the Roshar Investiture pool?

Brandon Sanderson [PENDING REVIEW]

Yes.

Overlord Jebus [PENDING REVIEW]

There is? Have we had any hints of it at all?

Brandon Sanderson [PENDING REVIEW]

Yes.

Oathbringer release party ()
#7 Share

Questioner [PENDING REVIEW]

Where do gemstones come from?

Brandon Sanderson [PENDING REVIEW]

Gemstones on Roshar are mostly coming from gemhearts. And, I remembered to stick in some mentions of this in Oathbringer, 'cause a lot of people have been asking about this. It's not something-- like, the daily ranching of animals for their gemhearts is not something that we bring up a lot, but there is some limited mining operations on Roshar as well, you've just gotta get through the crem.

Stormlight Three Update #4 ()
#9 Share

Yata

In Oathbringer will we discover how the type of a gemheart is decided? (what polestone you will find once the gemheart is gathered) I have this doubt for months and probably is a really not relevant think but I have the constant feel of "I am missing something"

Brandon Sanderson

You're asking why certain species have emerald gemhearts, while others have a different type of gemstone?

Yata

In the end yes. Actually, I was even unsure if a specific species had a specific polestone as gemheart. In the books is never esplicity stated but (in-world) nobody ever asked what kind of polestone is retrieved after the death of a chasmfield (as if it was obvious fact) but I had not actually confirmations until now :)

Brandon Sanderson

Note that there are some species that vary. But many do not, which is what made chasmfiends so valuable.

Oathbringer Chicago signing ()
#10 Share

Questioner [PENDING REVIEW]

In this world, assuming that [Roshar] is as old as it appears to be, wouldn't it be that the creatures that have gemhearts in them, as they die their body would rot away but leaving the gemstone? So wouldn't fossil beds exist with layers of gemstones in them from the passing of the ages?

Brandon Sanderson [PENDING REVIEW]

Yeah, that's why-- yes.

Questioner [PENDING REVIEW]

That's how they mine them?

Brandon Sanderson [PENDING REVIEW]

They do mine them. What you've got to remember is, in my opinion these things are going to collect in certain ways in certain places.

Questioner [PENDING REVIEW]

Densities and stuff.

Brandon Sanderson [PENDING REVIEW]

Yeah. But yeah. Because there's no tectonic activity on Roshar, so.

Questioner [PENDING REVIEW]

Just the buildup of crem over time slowly covers things.

Brandon Sanderson [PENDING REVIEW]

Mmhmm.