Perma-Spike (and as an aside, Blood-Spikes)

[Through the Living Wrath he/him]

I wanna talk about Hemalurgic Compounding.

And a specific WoB I found from Brando Sando.

Quote

Argent

Is death in the Cosmere a two-stage process? It seems to me like (under normal circumstances) the body dies first, sending the mind fully in the Cognitive Realm; the soul, presumably, remains in the Spiritual for the entire process. I am a little unclear on what happens after that though - what is it that passes into the Beyond, just the mind? Does the soul / spiritual aspect / Spiritweb just kind of... break down in the Spiritual Realm, turn into free iInvestiture?

Brandon Sanderson

Yes. It's a two stage process, and most of what you said is correct. The odd thing is, though, that the Spiritweb doesn't completely break down (just like your body doesn't immediately break down.) Even after a long time, there's a record of that Spiritweb in the Spiritual Realm.

Oversleep

Wait wait wait. If there is a "corpse" of Spiritweb (so to speak) and actual, physical corpse is also there... Could it be still viable for Hemalurgy? Could it be still viable for Hemalurgy if you really know what you're doing and have some useful powers (manipulating Connection comes to mind)?

Could you patch the remnants of the Spiritweb and staple it to the body and end up with some zombie-zombie Lifeless? You'd still need to give it a mind but I figure Awakening is just doing that?

Brandon Sanderson

RAFO.

So what the coppermind states about Hemalurgical Compounding is that it splices the stores Spiritual DNA to the recipient.

What the Coppermind states about Spiritual DNA is that certain MoIs are encoded into the DNA

Now significantly, it says encoded, and compounding says spliced. Doesn’t seem to inspire the most confidence that the DNA will always be compatible between persons1.

But there are a few implications, assuming it is.

Imma use a list to organize myself.

 

1. Eco-friendly exchange.

2. Spiritual Depository

3. Blood makes Hemalurgy last longer. 

 

Eco-Friendly Exchange:

It seems as if Hemalurgic compounding has the same effect as regular Hemalurgy, putting their DNA with yours and possibly giving access to the powers. If not, these are still possible:

Power Inheritance. I see no reason why a descendant would inherent the DNA in a possibly more healthy/natural way.

Stacking: Can multiple spikes be consumed to overcome the decay in a way that Hemalurgy cannot?

Stealing: A spike can then be used to steal the power, likely.

 

Spiritual Depository:

If these powers can be stored in someone’s spiritual DNA, and if (this is the leap) they can be taken again, then there is a way to take the power with only the two drops in investiture. If you have an intermediary, you can spiritually splice them, then 60 years later you can spike them and get the power in a less diluted form. Depending on the powers of the intermediary, they may be able to last longer. Peeerrrrrma spike.

 

Blood Makes Hemalurgy Last Longer:

We know how this works, the Coppermind stating that this is due to the spike thinking that it has become part of a body.

Now, we also know that Khriss thought that Hemalurgic decay was “a thing of the past” (Ars Arcanum Lost Metal), and we know that Spiritwebs decay but do not disappear after death (the WoB)

So I don’t think this decay, unlike the initial decrease in power, actually comes from Ruin. (From what I understand) The spike isn’t actually charged with Ruins investiture, it has no business being there. I think the spike is recognized as a separate, dead Spiritweb that is beginning natural decay until it is boosted onto a living Spiritweb. This is probably what leads to the spike not decaying due to being within a body.

[Verdance he/him]

4 minutes ago, Through the Living Wrath said:

I wanna talk about Hemalurgic Compounding.

And a specific WoB I found from Brando Sando.

So what the coppermind states about Hemalurgical Compounding is that it splices the stores Spiritual DNA to the recipient.

What the Coppermind states about Spiritual DNA is that certain MoIs are encoded into the DNA

Now significantly, it says encoded, and compounding says spliced. Doesn’t seem to inspire the most confidence that the DNA will always be compatible between persons1.

But there are a few implications, assuming it is.

Imma use a list to organize myself.

 

1. Eco-friendly exchange.

2. Spiritual Depository

3. Blood makes Hemalurgy last longer. 

 

Eco-Friendly Exchange:

It seems as if Hemalurgic compounding has the same effect as regular Hemalurgy, putting their DNA with yours and possibly giving access to the powers. If not, these are still possible:

Power Inheritance. I see no reason why a descendant would inherent the DNA in a possibly more healthy/natural way.

Stacking: Can multiple spikes be consumed to overcome the decay in a way that Hemalurgy cannot?

Stealing: A spike can then be used to steal the power, likely.

 

Spiritual Depository:

If these powers can be stored in someone’s spiritual DNA, and if (this is the leap) they can be taken again, then there is a way to take the power with only the two drops in investiture. If you have an intermediary, you can spiritually splice them, then 60 years later you can spike them and get the power in a less diluted form. Depending on the powers of the intermediary, they may be able to last longer. Peeerrrrrma spike.

 

Blood Makes Hemalurgy Last Longer:

We know how this works, the Coppermind stating that this is due to the spike thinking that it has become part of a body.

Now, we also know that Khriss thought that Hemalurgic decay was “a thing of the past” (Ars Arcanum Lost Metal), and we know that Spiritwebs decay but do not disappear after death (the WoB)

So I don’t think this decay, unlike the initial decrease in power, actually comes from Ruin. (From what I understand) The spike isn’t actually charged with Ruins investiture, it has no business being there. I think the spike is recognized as a separate, dead Spiritweb that is beginning natural decay until it is boosted onto a living Spiritweb. This is probably what leads to the spike not decaying due to being within a body.

My eyes have been opened.

are there implications or anything to be extrapolated from this revelation considering Kelsier?

Edited March 10 by Through The Living Grass

[Through the Living Wrath he/him]

3 minutes ago, Through The Living Grass said:

My eyes have been opened.

are there implications or anything to be extrapolated from this revelation considering Kelsier?

Hmmmm

 

Kelsier’s Spiritweb was prolly decaying until he was spiked into a body

 

Uuuhhh this was revealed in Secret History but mainly has to do with Forests of Heck

Spoiler

also probably why Shades require specific rituals to become Shades, otherwise their Spiritweb decays to a point unrecognizable.

 

We don’t know much about Kelsier’s “body” though.

General Cosmere:

Spoiler

The decay might extend to all other uuuhhh forgetting the word ummm

Cognitive Shadows

there

Like Fused

Its also possible that containing the Spikes in some form of investiture instead of blood might have a greater effect on the decay.

 

[PanLin they/he]

22 minutes ago, Through the Living Wrath said:

It seems as if Hemalurgic compounding has the same effect as regular Hemalurgy, putting their DNA with yours and possibly giving access to the powers. If not, these are still possible:

Spoiler

Maru Nui

What happens when you burn a Hemalurgic spike?

Brandon Sanderson

Burning a Hemalurgic spike would have the effect of splicing your spiritual DNA to that of the person's that is in the spike, which would have some very strange consequences.

Tor.com Q&A with Brandon Sanderson (Jan. 10, 2011)

I don't think it's quite the same—normal Hemalurgy is like attaching a piece of someone else's soul to yours (albeit destructively), whereas this sounds more like having your Spiritweb permanently fused with the whole soul of the donor. Combined Identities, shared Connections, all sorts of weird shenanigans. It's something we don't understand the consequences of yet, but almost certainly would be far more destructive and chaotic than normal spiking.

25 minutes ago, Through the Living Wrath said:

Power Inheritance. I see no reason why a descendant would inherent the DNA in a possibly more healthy/natural way.

Metallic Arts are passed down through sDNA inheritance, so a parent with such mangled and bloated sDNA absolutely would have an effect on their child.

 

29 minutes ago, Through the Living Wrath said:

Spiritual Depository:

If these powers can be stored in someone’s spiritual DNA, and if (this is the leap) they can be taken again, then there is a way to take the power with only the two drops in investiture. If you have an intermediary, you can spiritually splice them, then 60 years later you can spike them and get the power in a less diluted form. Depending on the powers of the intermediary, they may be able to last longer. Peeerrrrrma spike.

This is a neat (though potentially horrifying) idea. Considering the mess that would be made of a repeatedly spiked Spiritweb, you'd really have to know what you were doing when it came to extracting the right powers, and I wonder if the same Identity contamination would apply to this as with normal spiking. From the wiki:

Spoiler

There is a maximum number of spikes a person can have before causing issues of mental and/or physical limitations.^[29][30] The number of spikes a person can take has been reduced since Ruin was merged with Preservation. If too many spikes are added, the soul stops gaining powers. Compounding is also inaccessible, under normal methods, to any Hemalurgist made after the Shards merged.^[31][29] There are ways to bypass this limitation, but said ways are currently unknown. This relates to the nature of Ruin's subservience to Preservation in the current dual vessel of Harmony and something known as "Identity contamination".^[31][29]

 

33 minutes ago, Through the Living Wrath said:

So I don’t think this decay, unlike the initial decrease in power, actually comes from Ruin. (From what I understand) The spike isn’t actually charged with Ruins investiture, it has no business being there. I think the spike is recognized as a separate, dead Spiritweb that is beginning natural decay until it is boosted onto a living Spiritweb. This is probably what leads to the spike not decaying due to being within a body.

Agreed. Ruin's Invested Art is the stealing and destructive grafting of Spiritweb pieces. Once a spike has been made, it's just a loose bit of Spiritweb. Exactly the same concept as organs dying if they're not transplanted fast enough, or a plant cutting starting to die until you graft it onto another one and it can access the nutrients it needs.

The 'corpse' analogy gives us everything we need there: theoretically, you could always look at a dead person's Spiritweb and (with the right knowledge) know which attributes they had in life, it'll just be inert and unable to grant those attributes anymore.

 

26 minutes ago, Through the Living Wrath said:

Kelsier’s Spiritweb was prolly decaying until he was spiked into a body

Kelsier is a Sliver, which makes his soul (and therefore Spiritweb) able to exist indefinitely. His only issue is that, since he died, he's lost his natural Connection to the physical realm. From the wiki:

Spoiler

Most notably, Slivers can resist the pull of the Beyond indefinitely and choose to instead remain in the cosmere as a Cognitive Shadow if they wish.^[13][14]

'Indefinitely' basically confirms that his Spiritweb wouldn't decay.

[Through the Living Wrath he/him]

10 minutes ago, PanLin said:

  Hide contents

Maru Nui

What happens when you burn a Hemalurgic spike?

Brandon Sanderson

Burning a Hemalurgic spike would have the effect of splicing your spiritual DNA to that of the person's that is in the spike, which would have some very strange consequences.

Tor.com Q&A with Brandon Sanderson (Jan. 10, 2011)

I don't think it's quite the same—normal Hemalurgy is like attaching a piece of someone else's soul to yours (albeit destructively), whereas this sounds more like having your Spiritweb permanently fused with the whole soul of the donor. Combined Identities, shared Connections, all sorts of weird shenanigans. It's something we don't understand the consequences of yet, but almost certainly would be far more destructive and chaotic than normal spiking.

Metallic Arts are passed down through sDNA inheritance, so a parent with such mangled and bloated sDNA absolutely would have an effect on their child.

 

This is a neat (though potentially horrifying) idea. Considering the mess that would be made of a repeatedly spiked Spiritweb, you'd really have to know what you were doing when it came to extracting the right powers, and I wonder if the same Identity contamination would apply to this as with normal spiking. From the wiki:

  Hide contents

There is a maximum number of spikes a person can have before causing issues of mental and/or physical limitations.^[29][30] The number of spikes a person can take has been reduced since Ruin was merged with Preservation. If too many spikes are added, the soul stops gaining powers. Compounding is also inaccessible, under normal methods, to any Hemalurgist made after the Shards merged.^[31][29] There are ways to bypass this limitation, but said ways are currently unknown. This relates to the nature of Ruin's subservience to Preservation in the current dual vessel of Harmony and something known as "Identity contamination".^[31][29]

 

Agreed. Ruin's Invested Art is the stealing and destructive grafting of Spiritweb pieces. Once a spike has been made, it's just a loose bit of Spiritweb. Exactly the same concept as organs dying if they're not transplanted fast enough, or a plant cutting starting to die until you graft it onto another one and it can access the nutrients it needs.

The 'corpse' analogy gives us everything we need there: theoretically, you could always look at a dead person's Spiritweb and (with the right knowledge) know which attributes they had in life, it'll just be inert and unable to grant those attributes anymore.

 

Kelsier is a Sliver, which makes his soul (and therefore Spiritweb) able to exist indefinitely. His only issue is that, since he died, he's lost his natural Connection to the physical realm. From the wiki:

  Hide contents

Most notably, Slivers can resist the pull of the Beyond indefinitely and choose to instead remain in the cosmere as a Cognitive Shadow if they wish.^[13][14]

'Indefinitely' basically confirms that his Spiritweb wouldn't decay.

I disagree with the last point. He can remain indefinitely, but I don’t know if it’ll be the same him

like radioactive decay, there might be some sort of half-life, rather than he’ll “disappear” in this many years

But I did note that if a dead spiritweb is saturated with investiture, they might not decay at all, which does support what you say…

 

hmmmm

I think prolly the most promising thing would be physical inheritance of stolen DNA, it would let certain people (the Set?) control where the powers lie

[Trusk'our he/him]

11 hours ago, Through the Living Wrath said:

1. Eco-friendly exchange.

. . .

Eco-Friendly Exchange:

It seems as if Hemalurgic compounding has the same effect as regular Hemalurgy, putting their DNA with yours and possibly giving access to the powers.

It doesn't sound like an Allomancer burning a Hemalurgic spike would give them access to powers within them (unfortunately).

Spoiler

https://wob.coppermind.net/events/76-shadows-of-self-chicago-signing/#e6295

Questioner

If you burn a Hemalurgic spike, would it graft the piece of stolen soul onto your soul?

Brandon Sanderson

No, but it would have... There are some interesting effects there.

Sounds like from another WoB that some sDNA gets spliced in, but it probably isn't a functional ability.

Spoiler

https://wob.coppermind.net/events/210-torcom-qa-with-brandon-sanderson/#e4616

Maru Nui

What happens when you burn a Hemalurgic spike?

Brandon Sanderson

Burning a Hemalurgic spike would have the effect of splicing your spiritual DNA to that of the person's that is in the spike, which would have some very strange consequences.

 

11 hours ago, Through the Living Wrath said:

If not, these are still possible:

Power Inheritance. I see no reason why a descendant would inherent the DNA in a possibly more healthy/natural way.

Not a bad idea. There are nobles in TFE like Vin's father who have high Allomantic potential they can pass to their children, but they themselves aren't even a Misting.

11 hours ago, Through the Living Wrath said:

Stacking: Can multiple spikes be consumed to overcome the decay in a way that Hemalurgy cannot?

So. . . burn multiple spikes to add the power to the Allomancer, which will hopefully increase their Allomantic potential beyond normal? I don't think I understand what you're saying here.

11 hours ago, Through the Living Wrath said:

Stealing: A spike can then be used to steal the power, likely.

I assume this is a continuation of stacking, just taken a step further where you try to enhance the piece of Spiritweb for your second spike by having an Allomancer burn the first?

11 hours ago, Through the Living Wrath said:

Spiritual Depository:

If these powers can be stored in someone’s spiritual DNA, and if (this is the leap) they can be taken again, then there is a way to take the power with only the two drops in investiture. If you have an intermediary, you can spiritually splice them, then 60 years later you can spike them and get the power in a less diluted form. Depending on the powers of the intermediary, they may be able to last longer. Peeerrrrrma spike.

I mean, dumping a spike in blood or a cut of meat prevents continual decay (or at least is implied to do so as long as the organics are fresh enough to confuse the spike for them being alive), and aluminum can likely do better.

Under this method, you'd need to kill or at least seriously damage the Allomancer at a later date, in the meantime you cannot use the powers of the spike. Plus, there should be a second guaranteed decay in the power since you need to excise it not just from one donor, but from two.

11 hours ago, Through the Living Wrath said:

Now, we also know that Khriss thought that Hemalurgic decay was “a thing of the past” (Ars Arcanum Lost Metal), and we know that Spiritwebs decay but do not disappear after death (the WoB)

So I don’t think this decay, unlike the initial decrease in power, actually comes from Ruin. (From what I understand) The spike isn’t actually charged with Ruins investiture, it has no business being there. I think the spike is recognized as a separate, dead Spiritweb that is beginning natural decay until it is boosted onto a living Spiritweb. This is probably what leads to the spike not decaying due to being within a body.

My own thought process is that when a Hemalurgic spike is created using Ruin's system, it corrupts a portion of the Investiture, aligning it with Ruin. This would explain how spikes add a direct Connection to Ruin despite- in the vast majority of cases- stealing fragments of Preservation's Investiture from Spiritwebs.

Furthermore- TSM spoilers:

Spoiler

We see a use of Hemalurgy or a very similar system in the Cinderhearts and the Charred they create. That system does use a bit of Ruin in it, likely in the small amount of Investiture added to the Sunhearts to create Cinderhearts. 

Spoiler

https://wob.coppermind.net/events/551-youtube-spoiler-stream-7/#e17072

Seth

I notice a lot of similarities between the Charred and the Inquisitors. Loss of personality, corruption of Investiture, bloodlust, violent tendencies, etc. The Scadrian scientists were responsible for teaching the Cinder King how to create them, and they mentioned how you have to add a "special form of Investiture" to the sunhearts in order to result in a Charred warrior. My question is: is that "special Investiture" Hemalurgy or Connected to Ruin?

Brandon Sanderson

Yes. Good job.

Adam Horne

This is why you don't make your questions yes or no.

Brandon Sanderson

Well no, I don't know if I would have said more. I think that is an excellent question. Sometimes you don't want to ask yes or no questions. Sometimes you do, because you want to know if you're theorizing the right direction. This is the way to ask a yes or no question. I don't know that I would have given any more, and so asking it yes or no lets me say yes rather than RAFO. And I think I would have RAFO'd it if they would have asked it more open-ended. 

Even when this Investiture is removed the Cinderhearts can function like Hemalurgic spikes and splice Investiture to the bearer's Spiritweb, as seen with Rebeke's transformation into becoming a Charred (though the Ruinous Investiture may be needed to initiate the process).

This also suggests to me that the standard spike made using Ruin's methods directly attaches a piece of its Investiture, whether though my previously assumed corruption (which can also explain a part of the unavoidable initial decay) or if it's just injected in.

In other words, I have a strong feeling that most Hemalurgic spikes will have a portion of Ruin's own Investiture in them.

Edited March 11 by Trusk'our
Changed wording for clarification of intent.

[Through the Living Wrath he/him]

7 minutes ago, Trusk'our said:

It doesn't sound like an Allomancer burning a Hemalurgic spike would give them access to powers within them (unfortunately).

  Reveal hidden contents

https://wob.coppermind.net/events/76-shadows-of-self-chicago-signing/#e6295

Questioner

If you burn a Hemalurgic spike, would it graft the piece of stolen soul onto your soul?

Brandon Sanderson

No, but it would have... There are some interesting effects there.

Sounds like from another WoB that some sDNA gets spliced in, but it probably isn't a functional ability.

  Reveal hidden contents

https://wob.coppermind.net/events/210-torcom-qa-with-brandon-sanderson/#e4616

Maru Nui

What happens when you burn a Hemalurgic spike?

Brandon Sanderson

Burning a Hemalurgic spike would have the effect of splicing your spiritual DNA to that of the person's that is in the spike, which would have some very strange consequences.

 

Not a bad idea. There are nobles in TFE like Vin's father who have high Allomantic potential they can pass to their children, but they themselves aren't even a Misting.

So. . . burn multiple spikes to add the power to the Allomancer, which will hopefully increase their Allomantic potential beyond normal? I don't think I understand what you're saying here.

I assume this is a continuation of stacking, just taken a step further where you try to enhance the piece of Spiritweb for your second spike by having an Allomancer burn the first?

I mean, dumping a spike in blood or a cut of meat prevents continual decay (or at least is implied to do so as long as the organics are fresh enough to confuse the spike for them being alive), and aluminum can likely do better.

Under this method, you'd need to kill or at least seriously damage the Allomancer at a later date, in which case you cannot use the powers of the spike. Plus, there should be a second guaranteed decay in the power since you need to excise it not just from one donor, but from two.

My own thought process is that when a Hemalurgic spike is created using Ruin's system, it corrupts a portion of the Investiture, aligning it with Ruin. This would explain how spikes add a direct Connection to Ruin despite- in the vast majority of cases- stealing fragments of Preservation's Investiture from Spiritwebs.

Furthermore- TSM spoilers:

  Reveal hidden contents

We see a use of Hemalurgy or a very similar system in the Cinderhearts and the Charred they create. That system does use a bit of Ruin in it, likely in the small amount of Investiture added to the Sunhearts to create Cinderhearts. 

  Reveal hidden contents

https://wob.coppermind.net/events/551-youtube-spoiler-stream-7/#e17072

Seth

I notice a lot of similarities between the Charred and the Inquisitors. Loss of personality, corruption of Investiture, bloodlust, violent tendencies, etc. The Scadrian scientists were responsible for teaching the Cinder King how to create them, and they mentioned how you have to add a "special form of Investiture" to the sunhearts in order to result in a Charred warrior. My question is: is that "special Investiture" Hemalurgy or Connected to Ruin?

Brandon Sanderson

Yes. Good job.

Adam Horne

This is why you don't make your questions yes or no.

Brandon Sanderson

Well no, I don't know if I would have said more. I think that is an excellent question. Sometimes you don't want to ask yes or no questions. Sometimes you do, because you want to know if you're theorizing the right direction. This is the way to ask a yes or no question. I don't know that I would have given any more, and so asking it yes or no lets me say yes rather than RAFO. And I think I would have RAFO'd it if they would have asked it more open-ended. 

Even when this Investiture is removed the Cinderhearts can function like Hemalurgic spikes and splice Investiture to the bearer's Spiritweb, as seen with Rebeke's transformation into becoming a Charred (though the Ruinous Investiture may be needed to initiate the process).

This also suggests to me that the standard spike made using Ruin's methods directly attaches a piece of its Investiture, whether though my previously assumed corruption (which can also explain a part of the unavoidable initial decay) or if it's just injected in.

In other words, I have a strong feeling that most Hemalurgic spikes will have a portion of Ruin's own Investiture in them.

Hmmm

all good points

I was most excited about sDNA inheritance.

Spliced does imply a more advanced addition—some jumbling. That makes sense. I think that the jumbling may be smoothed out upon inheritance, making the trait manifest more clearly.

What I understand from that WoB (I think I’m repeating myself here), actually, is that some shenanigans are going on. Liked it won’t allow the person to gain powers, it won’t stretch the web that way. But it will give them the possibility. It might make them like Vins father—sDNA not quite aligned, but a bunch of it there.

But if one person burns multiple packets of sDNA, it might bring a higher concentration of sDNA. At the least, I believe it would increase inheritance chance, if not power. (Power is very unlikely to be encoded by quantity of encoding, after all…)

But that thought makes me curious about the composition of a spiritweb. (Are there any WoBs you know about that? Imma go search…). How much of it is dedicated to that?

I gotta go sleep

[Trusk'our he/him]

13 hours ago, Through the Living Wrath said:

Hmmm

all good points

I was most excited about sDNA inheritance.

Spliced does imply a more advanced addition—some jumbling. That makes sense. I think that the jumbling may be smoothed out upon inheritance, making the trait manifest more clearly.

What I understand from that WoB (I think I’m repeating myself here), actually, is that some shenanigans are going on. Liked it won’t allow the person to gain powers, it won’t stretch the web that way. But it will give them the possibility. It might make them like Vins father—sDNA not quite aligned, but a bunch of it there.

But if one person burns multiple packets of sDNA, it might bring a higher concentration of sDNA. At the least, I believe it would increase inheritance chance, if not power. (Power is very unlikely to be encoded by quantity of encoding, after all…)

But that thought makes me curious about the composition of a spiritweb. (Are there any WoBs you know about that? Imma go search…). How much of it is dedicated to that?

So, you mean composition as in what percentages of the Spiritweb are dedicated to its various attributes, including the part dedicated to the Allomancy gene?

If so, then I'm sorry to say I'm not aware of any specific measurements. Most interactions with Investiture in any way are fairly vague right now. It won't be until a bit later in the Cosmere that the concept of BEUs and the scientific method will be introduced to magic (though Era 3 Mistborn will begin doing this).

[PanLin they/he]

12 hours ago, Through the Living Wrath said:

Spliced does imply a more advanced addition—some jumbling. That makes sense. I think that the jumbling may be smoothed out upon inheritance, making the trait manifest more clearly.

So this is an interesting discussion, but honestly I think you're underestimating the severity of this splicing.

I just want to take a step back to look at what Compounding does. I'm also going to start using F-Compounding and H-Compounding to differentiate between feruchemy and hemalurgy.

With normal Allomancy, metals are used to essentially prop the right window open to Preservation's power. As long as your Spiritweb has the right feature to allow you to use a given metal, then as long as you're burning that metal, that specific window stays open and that specific power is fed to you directly from Preservation's Investiture. The metal isn't a fuel, but a filter/key.

If an Allomancer tries to burn a metalmind with a different Identity to their own, nothing happens. When F-Compounding, some of the Investiture that should be coming from Preservation is actually coming from the metalmind. Firstly, this changes the type of key from whatever it should be allomantically to be the feruchemical one, basically as a signal to the Spiritual Realm that is routed to Preservation. This means that, instead of accessing one of the abilities designed by Preservation for allomancers, it's accessing the feruchemical attribute in a way that was never meant to happen.

Secondly, it acts as a sort of catalyst and wildly increases the amount of the attribute available as it isn't being carefully controlled by the limits Preservation put in place; the Investiture from the metalmind itself either widens the allomantic 'window' or piggy-backs on the active Connection between the allomancer and Preservation to create its own link, suddenly flooding the allomancer with wayyyy more of the ability than should be possible, and definitely more than is safe.

Essentially, F-Compounding uses allomancy as a tool to bypass the rules of feruchemy—instead of drawing from the metalmind, you're using the metalmind as a template to draw directly from Preservation.

If we apply that same thinking to Hemalurgy, it's honestly pretty scary:

• Normal hemalurgy stores attributes similar to feruchemy, but also contains the torn and damaged pieces of the Spiritweb it came from
• Hemalurgic spiking grants a Connection to Ruin
• Allomancy only Connects to Preservation because every Allomancer has a piece of Preservation in their Spiritweb, and burning an allomantic metal creates a spiritual bridge between those two pieces of Preservation
• The act of burning itself is not unique to Preservation (if it were, Hoid wouldn't have been able to burn Lerasium to become an allomancer). This means that the type of Connection granted by burning a metal is dependent on either what is being burned, who is burning it, or both
• The purpose of a hemalurgic spike is to attach a limited piece of someone's Spiritweb to your own
• If F-Compounding uses the attribute in a metalmind as a template to grab more of it, then logically H-Compounding uses the Spiritweb chunk in the spike as a template to grab more of it (ie: more of the Spiritweb, not just the attribute)
• Hemalurgic spikes almost always contain an Identity different to your own and some scraps of Connection from the original Spiritweb
• Spikes use Ruin's investiture to force the Spiritweb chunk to graft to yours, overwriting/bypassing the difference in Identity
• F-Compounding forcefully grabs the attribute matching the stored one from the spiritual realm and rams it into the allomancer

So, taking all of those bits of context into account, a hemalurgic spike would, first of all, change the allomantic key in a weird way—not only would it replace the allomantic power with the hemalurgic one, but it would also contain the code (or coordinates or whatever) to the Spiritweb of the person the spike came from. It would then Connect to that donor's Spiritweb, along with either a Connection to Preservation that is corrupted by Ruin, an equal Connection to both Shards, or a Connection to Ruin alone.

By that logic, H-Compounding forcefully grabs the Spiritweb matching the stored chunk and rams it into the allomancer, ignoring Shardic oversight and using Ruin's destructive Investiture to make it stick. It's not just 'stronger hemalurgy', it's a wildly chaotic mashing of two souls. There's no guarantee the allomancer would even be themselves in any meaningful way after that, let alone be stable or sane enough to hold the combination of two minds and souls in a useful way.

Even normal hemalurgic spikes permanently change the recipient's physical and spiritual make-up. There's really no telling what physical and spiritual changes would come from something as destructive as this, or whether they'd even be able to have children.

"more advanced addition—some jumbling" doesn't begin to cover it.