A few thoughts about nicrosil compounding.

[AffordableInvestiture He/Him]

All right, I have a theory that nicrosil compounding is just as good if not better than atium compounding, as while atium allows you to compound youth, nicrosil lets you compound investiture. So let’s say that a nicrosil twinborn is invested with about 1 BEU.(Idk if that’s right but for I’m doing it for simplicity’s sake.) If they store their powers in a metalmind for 1 hour, then burn that metal for 10 hours worth of their powers and store it all in a metalmind, and repeat this process until they have 100,000s(maybe even 1,000,000s?) of hours stored up, then if they tap their investiture at an incredible rate, allowing them to become very heavily invested, essentially granting agelessness, as we have seen is a side effect of being invested enough, as we have seen with Dawnshard holders, as well as awakeners of the 5th heightening. Granted they would need to keep this up going through a ridiculous amount of nicrosil. Another thought of mine is if a nicrosil twinborn went to Roshar, and bonded a radiant spren, drew in some stormlight and stored it in a metalmind, they could in theory compound it for unlimited stormlight,(also provided they have a ton of nicrosil on them) this could be used on top of my previous idea to essentially make an immortal knight radiant who never runs out of stormlight. Thanks for taking the time to read this! Is it plausible?

[Through the Living Heir he/him]

I’ve theorized about gaining infinite investiture in an otherwise closed system in the past, and this is where criticism focused. Essentially, we don’t know enough about nicrosil to know what it can do. Some people believe that it stores the ability to use investiture, some say actual investiture, and some say both. My opinion is that until we know more, shenanigans like this one can assume either or both possibilities. 
In order to gain your absurd amount of nicrosil, the radiant could specifically be an elsecaller, and soulcast parts of their own body into nicrosil, then burn it for the stormlight needed to heal it back. Additionally, if stormlight can be compounded, so can breath, so the radiant twinborn could compound one breath that they got somewhere. (They could give one back to the person that gave it to them, after multiplying it.) 

Basically, if nicrosil does work this way, it’s very powerful, at least in isolated situations where you can give them four different powers, but we don’t actually know how it works yet. Our best clue is the medallions, which don’t really work this way, and the Bands, which kinda do,  but not really. We’ll have to wait for era three or an non-RAFO WoB to know more. 

[Trusk'our he/him]

4 hours ago, AffordableInvestiture said:

All right, I have a theory that nicrosil compounding is just as good if not better than atium compounding, as while atium allows you to compound youth, nicrosil lets you compound investiture. So let’s say that a nicrosil twinborn is invested with about 1 BEU.(Idk if that’s right but for I’m doing it for simplicity’s sake.) If they store their powers in a metalmind for 1 hour, then burn that metal for 10 hours worth of their powers and store it all in a metalmind, and repeat this process until they have 100,000s(maybe even 1,000,000s?) of hours stored up, then if they tap their investiture at an incredible rate, allowing them to become very heavily invested, essentially granting agelessness, as we have seen is a side effect of being invested enough, as we have seen with Dawnshard holders, as well as awakeners of the 5th heightening. Granted they would need to keep this up going through a ridiculous amount of nicrosil. Another thought of mine is if a nicrosil twinborn went to Roshar, and bonded a radiant spren, drew in some stormlight and stored it in a metalmind, they could in theory compound it for unlimited stormlight,(also provided they have a ton of nicrosil on them) this could be used on top of my previous idea to essentially make an immortal knight radiant who never runs out of stormlight. Thanks for taking the time to read this! Is it plausible?

This is a really cool idea, but I don't think it would grant true agelessness; TLR compounded metals with Allomancy far stronger than anyone else (which is the main factor determining how potent your compounding is), yet that extra Investiture did nothing to save him once his Metalminds were lost briefly. 

I see a few practical reasons nicrosil compounding wouldn't work. For one, you wouldn't likely be able to sustain the reaction, as your Allomancy gives you Investiture at a rate depending on its strength (stronger Allomancy equals more Investiture that can be hacked to fuel Feruchemy). And, since Metalborn aren't considered terribly Invested compared to, say, the Knights Radiant, I don't think such a reaction could be maintained. 

Second, let's say you bypass this limitation with a supercharged Hemalurgic spike that grants nicrosil Allomancy (somehow far surpassing Rashek himself for this reaction to work), or perhaps compound obscene amounts of nicrosil on a regular basis with the aid of duralumin Allomancy. Even so, Metalminds have a real limit to how much Investiture they can carry, so unless you restrict yourself to hiding in a building made entirely of nicrosil your entire millenia-long life, you wouldn't be able to maintain youthfulness and longevity.

Third, the possibility of youthfulness depends from nicrosil compounding relies on the idea that kinetic Investiture with allow for agelessness as well, not just static Investiture. While it may be possible, kinetic Investiture is actively used up and lost to the compounder, which again, makes this process that much more difficult to sustain. 

[Quantus he/him]

15 minutes ago, Trusk'our said:

This is a really cool idea, but I don't think it would grant true agelessness; TLR compounded metals with Allomancy far stronger than anyone else (which is the main factor determining how potent your compounding is), yet that extra Investiture did nothing to save him once his Metalminds were lost briefly. 

I see a few practical reasons nicrosil compounding wouldn't work. For one, you wouldn't likely be able to sustain the reaction, as your Allomancy gives you Investiture at a rate depending on its strength (stronger Allomancy equals more Investiture that can be hacked to fuel Feruchemy). And, since Metalborn aren't considered terribly Invested compared to, say, the Knights Radiant, I don't think such a reaction could be maintained. 

Second, let's say you bypass this limitation with a supercharged Hemalurgic spike that grants nicrosil Allomancy (somehow far surpassing Rashek himself for this reaction to work), or perhaps compound obscene amounts of nicrosil on a regular basis with the aid of duralumin Allomancy. Even so, Metalminds have a real limit to how much Investiture they can carry, so unless you restrict yourself to hiding in a building made entirely of nicrosil your entire millenia-long life, you wouldn't be able to maintain youthfulness and longevity.

Third, the possibility of youthfulness depends from nicrosil compounding relies on the idea that kinetic Investiture with allow for agelessness as well, not just static Investiture. While it may be possible, kinetic Investiture is actively used up and lost to the compounder, which again, makes this process that much more difficult to sustain. 

4th, Compounding grants the Feruchemical form of the metal, and By the wording of the relevant charts Nicrosil stores the Ability to Use Powers, not the Raw Investiture (that's Hemalurgic Nicrosil).  Compounding Bronze, for example, would let you multiply your power as if you had multiple spikes and gaint he ability to pierce copperclouds, or ditto Zinc to be able to control Koloss.  But you'd still have to then burn the relevant metals to activate the power and you'd still only be Invested while maintaining a Burn.  

5th, Compounding that much would inevitably move you down the path to Savantism, which is supposed to always suck at least a little bit.  

[alder24]

5 hours ago, AffordableInvestiture said:

All right, I have a theory that nicrosil compounding is just as good if not better than atium compounding, as while atium allows you to compound youth, nicrosil lets you compound investiture. So let’s say that a nicrosil twinborn is invested with about 1 BEU.(Idk if that’s right but for I’m doing it for simplicity’s sake.) If they store their powers in a metalmind for 1 hour, then burn that metal for 10 hours worth of their powers and store it all in a metalmind, and repeat this process until they have 100,000s(maybe even 1,000,000s?) of hours stored up, then if they tap their investiture at an incredible rate, allowing them to become very heavily invested, essentially granting agelessness, as we have seen is a side effect of being invested enough, as we have seen with Dawnshard holders, as well as awakeners of the 5th heightening. Granted they would need to keep this up going through a ridiculous amount of nicrosil. Another thought of mine is if a nicrosil twinborn went to Roshar, and bonded a radiant spren, drew in some stormlight and stored it in a metalmind, they could in theory compound it for unlimited stormlight,(also provided they have a ton of nicrosil on them) this could be used on top of my previous idea to essentially make an immortal knight radiant who never runs out of stormlight. Thanks for taking the time to read this! Is it plausible?

Continuing arguments presented above:

6th - Compounding takes time, it's not instantaneous. If you want to have millions of hours worth of attribute, you have to burn metalminds for a really, really long time. Because that's what Compounding is, it's just using Allomancy - burning metals - to fuel Feruchemy, and burning metals takes time.