Musings about sunhearts

[NovaRay He/him]

In TSM to recharge sunhearts you have to add some heat/investiture to it and I’m wondering if you can supercharge a sunhearts by just leaving it out and having the sun do its thing. Is this possible or am I just remembering things wrong.

[Trusk'our he/him]

2 hours ago, NovaRay said:

In TSM to recharge sunhearts you have to add some heat/investiture to it and I’m wondering if you can supercharge a sunhearts by just leaving it out and having the sun do its thing. Is this possible or am I just remembering things wrong.

Well. . .

Stormlight Archive spoilers

Spoiler

We learn from Shallan/the Honorspren in RoW that Perfect Gemstones left exposed to multiple Highstorms will become more Invested than they would otherwise. 

So this isn't terribly implausible. I think it could work.

[Jult]

15 hours ago, NovaRay said:

In TSM to recharge sunhearts you have to add some heat/investiture to it and I’m wondering if you can supercharge a sunhearts by just leaving it out and having the sun do its thing. Is this possible or am I just remembering things wrong.

Yes! It's implied that this is what the Scadrians are doing in Chapter 45. They were studying just how much Investiture they could fit into a single sunheart. And Nomad notes that the one he sees in that Chapter has a much higher charge than normal. 

[NovaRay He/him]

Quote

2 hours ago, Jult said:

Yes! It's implied that this is what the Scadrians are doing in Chapter 45. They were studying just how much Investiture they could fit into a single sunheart. And Nomad notes that the one he sees in that Chapter has a much higher charge than normal. 

 

Thanks I have read sunlit man in a while so I forgot that detail.

[Trusk'our he/him]

On 1/16/2026 at 2:35 PM, Jult said:

Yes! It's implied that this is what the Scadrians are doing in Chapter 45. They were studying just how much Investiture they could fit into a single sunheart. And Nomad notes that the one he sees in that Chapter has a much higher charge than normal. 

I wonder, would repeated exposure just Invest it more, or would it also physically expand the Sunheart? Or, is it more explicitly tied to the physical body that was destroyed initially?

Edited January 18 by Trusk'our

[NovaRay He/him]

1 hour ago, Trusk'our said:

I wonder, would repeated exposure just Invest it more, or would it also physically expand the Sunheart? Or, is it more explicitly tied to the physical body that was destroyed initially?

It would probably be like the perfect gemstones more in the same space. 

[Xanpheon]

On 1/18/2026 at 3:24 AM, Trusk'our said:

I wonder, would repeated exposure just Invest it more, or would it also physically expand the Sunheart? Or, is it more explicitly tied to the physical body that was destroyed initially?

We know that the size of the Sunheart is somewhat defined by the innate investiture of the person being converted - but that it doesn't necessarily limit the amount of investiture being stored. The traveller from Roshar created a sunheart *notably* smaller than any Threnodite had due to the difference in innate investiture (interestingly, Zellion also commented that the traveller "likely" had breaths, which suggests that Breaths don't count) - and yet Zellion was able to siphon power into the "charged" sunheart to reduce the impact of the torment.

I don't think there's any concrete evidence either way, but considering the Sunheart we saw the Scadrians playing with was only identified as having an unusually high amount of investiture in it after it was touched, I doubt that they are expanded by having additional investiture in them.