New Mistborn RPG Hemalurgy Secret

[Trusk'our he/him]

I saw a new update regarding the Mistborn expansion of the Cosmere rpg, courtesy of @Atlas333 

Something that really got my gears working- what could the Eternity Spike be? What would it do? So far, I've got a few ideas:

1. It holds its charge indefinitely. This is fairly simple, but very potent in regards to Hemalurgy, particularly with how the campaign of Mistborn Legacy is set to span both Era 1 and Era 2.
2. It makes the bearer immortal in some fashion. Also fits the idea of spanning multiple eras- it could work by turning you into some ageless Hemalurgic construct, altering your Connection to age, or possibly just turning you into a CS and pinning you to a body.
3. It holds something vast and powerful, or is a key to such power. Could be that it holds Connection or Investiture directly from Sliver, Splinter, or Dawnsliver.

I'm really just spitballing right now, but I'm really, really looking forward to this campaign.

[CoderDrag0n8 He/They]

25 minutes ago, Trusk'our said:

It makes the bearer immortal in some fashion. Also fits the idea of spanning multiple eras- it could work by turning you into some ageless Hemalurgic construct, altering your Connection to age, or possibly just turning you into a CS and pinning you to a body.

Maybe it is what (Mistborn Era 2 spoilers) Kelsier uses to stay come back from being a CS

[Trusk'our he/him]

On 12/30/2025 at 12:20 PM, CoderDrag0n8 said:

Maybe it is what (Mistborn Era 2 spoilers) Kelsier uses to stay come back from being a CS

Ooo, that'd be cool.

It could be like how we learn of Taln's Honorblade and how it moved around. 

[JustQuestin2004 he/him]

On 12/31/2025 at 12:54 AM, Trusk'our said:

It holds its charge indefinitely. This is fairly simple, but very potent in regards to Hemalurgy, particularly with how the campaign of Mistborn Legacy is set to span both Era 1 and Era 2.

Probably not, Arcanists by Era 2 already know how to circumvent the over time Decay. Implied to be by covering spikes with aluminum.

On 12/31/2025 at 12:54 AM, Trusk'our said:

It makes the bearer immortal in some fashion. Also fits the idea of spanning multiple eras- it could work by turning you into some ageless Hemalurgic construct, altering your Connection to age, or possibly just turning you into a CS and pinning you to a body.

There is a WOB that states that anything that can be stored with Feruchemy, can also be stolen with Hemalurgy, so it could be possible for a Spike to steal Youth to increase one's total lifespan. Though that would only make you live roughly twice as long, not very Eternal if you ask me.

On 12/31/2025 at 12:54 AM, Trusk'our said:

It holds something vast and powerful, or is a key to such power. Could be that it holds Connection or Investiture directly from Sliver, Splinter, or Dawnsliver.

Imagine if it was a Lerasium Spike. Total waste of its primary use, but also still kind of useful for decent all around boost.

[Elite01]

I like the idea of the spike holding its charge forever 

it could also be a key to an Indiana jones style ruin where you put the spike into a statue and it opens a vault.

 

i wonder if it’s a spike that has a unique interaction with Kandra

[Trusk'our he/him]

On 12/31/2025 at 10:14 PM, JustQuestin2004 said:

Probably not, Arcanists by Era 2 already know how to circumvent the over time Decay. Implied to be by covering spikes with aluminum.

Could be the first example of preserving a Spike outside a body for great periods of time (using a process more efficient than jars of blood or cuts of meat, that is).

On 12/31/2025 at 10:14 PM, JustQuestin2004 said:

There is a WOB that states that anything that can be stored with Feruchemy, can also be stolen with Hemalurgy, so it could be possible for a Spike to steal Youth to increase one's total lifespan. Though that would only make you live roughly twice as long, not very Eternal if you ask me.

Spike multiple people after figuring out Identity contamination. 

Or, following on @Elite01's suggestion, maybe spike a super long-lived creature like a Kandra? Weirder ramifications for that, if possible. 

On 12/31/2025 at 10:14 PM, JustQuestin2004 said:

Imagine if it was a Lerasium Spike. Total waste of its primary use, but also still kind of useful for decent all around boost.

I had a thought cross my mind before- Lerasium steals all attributes, right? Could it maybe take most of the Spiritweb, preserving it like a Cognitive Shadow?

That's assuming the Cognitive Aspect sticks to the Spiritweb, which goes against standard Hemalurgy use as far as I'm aware, but it is using the essence of Preservation as a focus, so. . .

[JustQuestin2004 he/him]

25 minutes ago, Trusk'our said:

Could be the first example of preserving a Spike outside a body for great periods of time (using a process more efficient than jars of blood or cuts of meat, that is).

Maybe, but that would be a bit disappointing. "Hey guys! This super cool macguffin that the entire campaign is based around is called the Spike of Eternity! What does it do? It doesn't lose it Hemalurgic charge over time! What power does it give? I dunno, Coinshot powers? What do you mean that's 'anti-climactic?"

30 minutes ago, Trusk'our said:

Or, following on @Elite01's suggestion, maybe spike a super long-lived creature like a Kandra? Weirder ramifications for that, if possible. 

Kandra lifespan is weird, a Mistwraith only lives 50 years, but Kandra live pretty much forever. Its probably because of their shapeshifting or something.

31 minutes ago, Trusk'our said:

I had a thought cross my mind before- Lerasium steals all attributes, right? Could it maybe take most of the Spiritweb, preserving it like a Cognitive Shadow?

That's assuming the Cognitive Aspect sticks to the Spiritweb, which goes against standard Hemalurgy use as far as I'm aware, but it is using the essence of Preservation as a focus, so. . .

Maybe if you completely store away your Identity if you get spiked with a Lerasium Spike, then tapped a bunch of gold after, the Identity and Attributes of the Lerasium spike might lead to you shapeshifting into the 'Donor' perhaps? The most convoluted and wasteful way of shapeshifting in the entire Cosmere.

[Trusk'our he/him]

14 minutes ago, JustQuestin2004 said:

Maybe, but that would be a bit disappointing. "Hey guys! This super cool macguffin that the entire campaign is based around is called the Spike of Eternity! What does it do? It doesn't lose it Hemalurgic charge over time! What power does it give? I dunno, Coinshot powers? What do you mean that's 'anti-climactic?"

Lol, fair enough. 

14 minutes ago, JustQuestin2004 said:

Kandra lifespan is weird, a Mistwraith only lives 50 years, but Kandra live pretty much forever. Its probably because of their shapeshifting or something.

Kandra lifespan seems to be a combo of their wacky biology (probably shape-shifting, as you say) and some magic/Investiture stuff.

Spoiler

https://wob.coppermind.net/events/357-read-for-pixels-2018/#e10583

Reilly Russell

Are kandra/mistwraiths naturally immortal? If so, is it magically sustained, or natural, like the immortal jellyfish? If not, what is the natural lifespan of a kandra/mistwraith?

Brandon Sanderson

No, they are not immortal, but they are very, very long lived. If you look at the First Generation, you'll see an example of aging happening. They will eventually die of old age. They don't suffer from some of the ailments that, say, humans do, and it takes a bit longer, and there is some magical sustaining of them going on.

 

Edited January 5 by Trusk'our

[Elite01]

It could be a spike that has multiple abilities.

like the powers that are stolen don’t decay and it’s been used multiple times so it has stuff similar to the bands of mourning 

coinshot x3, pewter x2, feruchemical copper etc 

I don’t know how that would be accomplished, a spike made of several metals? 

[Trusk'our he/him]

2 hours ago, Elite01 said:

It could be a spike that has multiple abilities.

like the powers that are stolen don’t decay and it’s been used multiple times so it has stuff similar to the bands of mourning 

coinshot x3, pewter x2, feruchemical copper etc 

I don’t know how that would be accomplished, a spike made of several metals? 

Seems plausible. 

Each power-related metal has four related abilities to steal, and a BoM style of blending metal could upgrade this.

Assuming that you can use a single Bindpoint on the recipient to use all those powers, at least. That would be the biggest hurtle, in my opinion. 

[Elite01]

Yeah I agree, with what we know about hemalurgy if you have spike with allomatic pewter you still need to know the right spot.

maybe part of the campaign is finding records of the right spot to “install” the infinity spike and the villains can’t use it till they find the records. 

maybe there’s a spot like the heart or something that works for all metal spikes
 

[Trusk'our he/him]

Guys- more info! 

 

At about 30 seconds in, he says the adventure revolves around protecting a powerful artifact, keeping the Eternity Spike out of the hands of those that would abuse its power.

I feel that this cuts out the hypothesis of it simply holding a charge that can exist indefinitely (though for it to continue being of importance between Eras it must be preserved descently anyway). Probably not about longevity either, since while it's useful that hardly seems worth keeping out of the hands of others, at least in my mind.

So I'm thinking it does have to do with great raw power (as they themselves say), or perhaps it functions as a key to a great power (Dawnshard Connection?)

Still not sure how that's supposed to manifest, though we have much better clues now.

[CoderDrag0n8 He/They]

On 3/13/2026 at 12:01 AM, Trusk'our said:

Dawnshard Connection

Ohhhh, It could be a spike holding the dawnshard...

That would be cool.

[JustQuestin2004 he/him]

The way this campaign is set up, where you have Era 1 characters going from Level 1-6, then have them set up a Legacy for Era 2 so the player make new Era 2 characters that start at Level 3, is really cool. Especially since that means you don't need to start from complete scratch on the second half of the campaign and can pick some extra Talents.

The 'Gilded Few' sound almost like an Era 1 version of the Set, with prominent members being a Mistborn and Hemalurgist. But they're for Era 1, who will continue the antagonizing in Era 2? The Set themselves? A new criminal group descended from the Gilded Few? 

Oh wait! We know from WOB that the Set were created indirectly from Kelsier's actions between Era 1 and 2, and that it might come up in a possible Secret History Novel if he ever gets around to writing it. Could this be it? Could Mistborn Legacy be the origins of the Set?

[Taco Rex]

On 3/13/2026 at 2:01 AM, Trusk'our said:

the adventure revolves around protecting a powerful artifact, keeping the Eternity Spike out of the hands of those that would abuse its power.

So what do yall think the Spike is then?

Until the whole "powerful artifact" thing, I assumed it was like an electrum-Atium alloy that stole Youth.

But is it really a Lerasium spike? Pure Lerasium supposedly steals all abilities (like strength, but not invested powers) so it wouldn't be granting metalluc arts. So maybe it's like a Koloss' spike that is used many times to grant a crazy high charge?

Could it be an Atium-Lerasium spike that steals all Abilities as well as a metallic Power?

Is it a offworld Godmetal? Could we be seeing an alloy of Trellium? Autonomy did influence Scadrial before Era 1 according to a WOB.

Is it just a standard metal spike charged with some offworld Investiture? If so, what could you steal that would make it be called a "powerful artifact"? 

 

[Trusk'our he/him]

16 minutes ago, Taco Rex said:

So what do yall think the Spike is then?

Until the whole "powerful artifact" thing, I assumed it was like an electrum-Atium alloy that stole Youth.

But is it really a Lerasium spike? Pure Lerasium supposedly steals all abilities (like strength, but not invested powers) so it wouldn't be granting metalluc arts. So maybe it's like a Koloss' spike that is used many times to grant a crazy high charge?

Could it be an Atium-Lerasium spike that steals all Abilities as well as a metallic Power?

Is it a offworld Godmetal? Could we be seeing an alloy of Trellium? Autonomy did influence Scadrial before Era 1 according to a WOB.

Is it just a standard metal spike charged with some offworld Investiture? If so, what could you steal that would make it be called a "powerful artifact"? 

I'm really not sure, though I think it's unlikely to be youthfulness or a basic human attribute- it was made out to be powerful and dangerous in such a way that it needs to be kept out of the hands of others. Those attributes can certainly be powerful, but not on a large scale, not within a single spike. 

The only comparable thing that comes to mind are the Bands of Mourning. They made someone incredibly dangerous and powerful, enough to warrant the kind of reaction it appears the game wants us to feel towards the Eternity Spike.

I also doubt it's effects would simply be a copy of the Bands, as that feels uninspired for storytelling. 

 

I could've sworn I saw somewhere that we were supposed to see "an unusual use of Hemalurgy" in Mistborn Legacy, but I can't find it anywhere. It very well may just be my imagination. 

[Elite01]

Maybe the spike makes a new hemalurgic construct like the Chimera we see in era 2? 
 

or could it be a god metal alloy? Like an 11th metal spike?