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I see where you are coming from but I dont necessarily buy the argument. Roshar has unique situation that periodically reduces all development back to a bronze age equivalent, and still (as you pointed out) Roshar did figure it out, at least twice. Nalthis, meanwhile, has a magic system that provides "Instinctual" understanding of its use so they arent nearly as restricted to pure Scientific development. And that's just one of the examples we have where development and scientific study has been pushed pretty far (arguably a lot further than modern Roshar). Let me put it this way: I think assuming that all things broadly falling under the category of "Investiture" will have all the same properties is folly, any more than assuming all things in the category of Energy all the same properties is silly.

Im not talking about Anti-Investiture, or really Im not talking specifically about the Intent/Inversion thing that happens to make the cancellation waveform. What Im saying is that I dont think you could extract Breath from an object or transfer metalmind Investiture or charge White Sand or Manipulate the Mists, etc. with a tuning fork. Investiture in the form of a Light reacts directly to sound, but there's no indication any of the others do or would. At the very least I would have expected the Heightened population of Nalthis to have noticed the effect on their own, between all the perfect pitch in their Art/Music, the existence of Instinctive Awakening as ability, and the ever-present Economic motivation of needing a way to recover breaths when their owner dies. But, I do acknowledge that those are circumstantial objections at best.

Rhythms are cosmere wide, sure. And the above WOB definitely implies that all Shards have a similar frequency association to the Pure Tones (which I dont believe are the same thing at all). I am still pretty skeptical that non-Light forms of investiture can be manipulated by sound directly anywhere in the Cosmere, as they are on Roshar.

Well, I dont think Forgery could do it, but that's mostly just because I think whatever effect made him Immortal and impose the restriction are the same thing, are a Dawnshard effect, and as such would way above the Investment level that Forgery could affect and/or override. Or worse, Forging it away would Forge away his Immortality and Snap him back to his real age like TLR.

Awesome, hadnt seen that one. Thanks!

Also, do Tones exist for all Shards or just the ones that are Invested in Roshar. Things were so disrupted (with the Sibling etc) precisely because a new Pure tone (Odium's) emerged once he'd Invested in the world enough.

Devil's Advocate statement here, but we dont know that any other forms of gaseous Investiture that is not manifesting as rosharan-style "Lights" would respond to sound or frequencies. If they did, for example, there should be some way to move investiture in or out of a Metalmind using the same mechanisms, and I dont think that would work for a few reasons (Identity being the first complication).

A-duralumin affects any metal burn, and for all practical purposes compounded F metals are just a different metal to allomancy. The targeted person has to have the relevant Allomancy to trigger the Burn, but in that case Duralumin can force a person to also burn up Metalminds and Spikes if they are of the proper metals.

It's a sliding scale and there is a lot of workable things you can do in the "less effective" zone. And I honestly think you Could make a lifeless phantom with 360 joints or extra limbs, etc, but I dont think you'd be able to animate it with the super-efficient 1-breath Command that was such a military breakthrough (which I strongly suspect only works with actual dead bodies) and would need at least the 50 they originally used. It the same with the rest of the awakening, where Cloth can certainly be animated but it will try to impose human shapes and mechanisms, and if it already has that shape because it's sewn into a doll shape it works easier and/or with less breaths required to animate it.

I cant recall any specifics but thought by then he'd changed out of his military uniform (something about a clean break) and was in something like surgeon's attire since he was working for his dad? Or did he put the uniform back on during the siege?

Not quite, if I hear you right. The commonly accepted understanding (mostly from the WOB you mention, I suspect) will animate the object but has to work within the normal properties of the material. It will move things that can flex on their own but wont make stone flexible or liquid cohesive. The Phantoms needed mechanical joints in the stone, but the Breaths become the animating force in place of Muscles (same as they would in a sheet of fabric. Otherwise, yes, they have at least the capabilities of a mortal human in terms of speed and even skills, since they are still just Lifeless. However, for the most part it works relative to human capabilities and shapes, so the less "normal" an action the more resistance you are likely to get from the breaths (ie a less effective Command). The other Nalthian lands are definitely fascinating to me too! Not quite Free according to a more recent clarification (which I cant seem to find right now). Conservation is a thing even with Investiture, and when asked about it he said something to the effect that an active Awakening would eventually use up the breaths that animate it, such that if it took 10 breaths to animate a wheel and you left it working for a long time, you might only get 9 breaths back.

He's "recently" discovered that he can hurt a cognitive entity, and he can certainly Do Harm on a normal emotional level (often as Wit, for example). I think anything an illusion could do would be fine for being non-physical harm. He would not be able to Trick somebody off a cliff or anything that is indirect but still physical like that, I assume. But a half-step to the left would be the normal Illusion rules (like anchoring it to a gem, etc) but with a significantly increased Duration. I could easily see it supplementing the Surge effect with Preservation/Allomantic Investiture (similar to Compounding) such that it lasts a lot longer than the initial Stormlight would accomplish.

Kandra dont know the secret to making Blessings, so they only have access to the ones that The Lord Ruler made for them. They know or presume it's possible, but dont have any that offer it or any way to make more. But that's about accessing it by the rules of Hemalurgy. Medallions are a Feruchemy-based tech that uses different mechanisms. Id have to go back and read that scene, but your explanation makes sense to me. Unclear I think, if only because we dont know the full details of the UnSealed Medallions (and the Excisors that are required), but there are options that would work. Assuming the medallion function doesnt have Identity implications beyond what we have confirmed, all it would take for that is for the people storing to be blanking their Identity, so the Shared Medallion would need to be a Two-power Medallion that grants F-Aluminum as well as whatever Ability they want to pool. This ensures that the Metalminds being filled are still UnKeyed. It was an UnSealed Copper medallion, anyone could store or retrieve from it. How Hoid got one of Kelsiers memories (and such a suspiciously significant one at that) is a different story; I suspect COmpounding Copper will make copies of the Memory, and that one is intended as something of a Ghostblood recruiting tool. It's worth noting that Kelsier is the one that gave Medallion tech ot the Southern Scadrians in the first place and made the Bands, so he has access to tricks we dont fully understand. With some convoluted steps and a feruchemist friend it's possible he could collect all he would need. You cannot use two medallions at once, and you have to Blank the Identity or not when you fill it. So he could not fill all 32 powers keyed to himself unless he was himself a Fullborn (which he most likely is not).

Death to the PARROTS, for they invite DISASTER!

Yup, but (apparently) a single Shard has the power to create a Planet or a Sapient race, but not both. Although, while we have another example of a shard creating the species (Nalthis) I cant actually be sure a single shard has the power to whip up a planet. At the scale and level of a Shard's actions, the magic itself doesnt have much in the way of hard limitations. Instead they are in a constant Battle of Will's with their Shard's Intent, and so long as the act doesnt put them in such conflict with the shards Intent that they go crazy *cough*cough* they would be able to get away with it. In this case Ruin believed he'd get to Destroy a whole planet that was 1/2 another shard's power, while Preservation secretly believed he could trick Ruin because Ruin has/had terrible Future Sight. At that point Investiture is just Investiture, a Spiritual third side of the triangle with Matter and Energy. And the Shards arent using some magic system mechanism to access it, they exist primarily in the infinite Spiritual Realm where everything comes from. And at the lower levels of 'normal' magic, the role of the Shard influences HOW the magic is obtained rather than what you can do with it. The flavor differences of Investitures (Breaths being "sticky", Stormlight being Leaky, Hemalurgy being End Negative, etc.) are the result of the Shard's involvement in that step. The Shards more or less bypass that and just have Are the Investiture. Also seems to apply to a person that has Ascended via absorbing the Well without actually taking up a shard, like The Lord Ruler did.

They made a Bargain, and a big part of Ruin's side was the promise that He'd get to destroy the whole planet eventually, while Preservation secretly hoped he'd be able to swindle Ruin and avoid that eventuality. Brief Coppermind writup:

Foamcore around a fiberglass ladder, as the main crossing support member?

Foam-core hobby board and a lot of hot glue will get you there if you have the budget. We made some pretty big stage sets out of them in high school and those needed to be light enough for a pair of stage-hands to move. You just have to sort of box out the structural parts to stiffen them up. Paper mache might be cheaper though, since you can do it with scrap newspaper and cardboard boxes. But that might take longer to build

Yes, easily, especially if Odium himself were involved since that's basically what happened with the Fused.

The Radiant Bondsmiths are still bound as they always were: By their own spren. They might be convinced to approve actions that Honor wouldn't like, now that he cant voice an opinion, but as the bond-holder they'd be the arbiter, just like the other radiants; it's why Syl was similarly disturbed by Jezrien's Honorblade. Ishar's Honorblade is different from the radiant Bondsmiths in that Honor was playing the role of that restraining Intelligence himself for all the Heralds, but now there is no other being involved to restrain whomever holds that Blade. I suspect the Sibling withdrew because Melishi talked them into the Parshman action whatever it actually was, and regretted it afterward (and/or blamed the Humans for convincing them to go along with it). EDIT: So if we thought Microkinesis was OP before, apparently it allowed direct Spiritweb manipulation. In theory and at their upper limits of realmic understanding, a Bondsmith only might be able to do that...

Known limits: Feruchemical effects are all Internal effects Feruchemy has hard limits to how much you can Store at one time (ie only the actual weight you have, etc) Some Feruchemy has practical if situational limits to how much you can use. For example, too much Strength and your muscled bloat so much you cannot move anymore. Feruchemy will protect you from it's own effects but not "related" things. So you cant be crushed under your own weight yet your bones arent any more durable or capable of resisting forces, and speed will not protect you from friction heat, etc. Steel Feruchemy has a hard limit per WOB, but he has not done the math and set the threshold yet.

The Human's arrival on Ashyn was separate from Odium, and Odium arrived after Honor and Cultivation had settled. But I cant find any information at all about the Ashyn society before the migration, other than the few cryptic mentions of Ishar and his Surges. Silence Divine is tentatively set to take place around book 8, fwiw, so its contemporary to "modern" Rosharan society.

My theory is that you should be able to steal being a full Mistborn by stealing the Connection with a Duralumin spike to Preservation that a Mistborn has (and lerasium creates), and Im then making an unconfirmed leap to assume the same would be possible with Feruchemy (even though we dont know how it's granted and whatnot). But the fact that Ruin apparently didnt know how it could be done is by far the best counter-argument Ive seen, thank you for that. Only thing I can think of that would still fit would be if Ruin did know how it could be done but didnt want the Inquisitors to have enough realmic knowledge to make the Connection method work.

There are three distinct characters named Red: The alethi deserter turned Lightweaver, the boatman in Era2 Elendel that Wayne frequents, and the deceased threnody bounty hunter named Red Young. I think both the first two are nicknames, and theoretically they could be the same person since Hoid has (will have had?) made that trip in that timeframe.

Hemalurgy can be used anywhere in the cosmere with any of the relevant metals from any source, so long as the user understand hemalurgy enough to have the proper Intent. Which makes it very interesting and dangerous once the culture clash happens. The only time we've seen Scadrian investiture bind a person to the planet, it was raw Preservation investiture that was sustaining a disembodied ghost. And once that ghost regained a body he didnt have the same issue (per wob). As for Marsh, I suspect he would not have anything against using a new spike, or in making one if the victim were somebody he'd be willing to kill anyway. His biggest issue I think would be that he already has way more Spikes than was typical for an Inquisitor (21 total) and the more you have the more unstable your Spiritweb becomes. Once upon a time he might have been possible to get full Mistborn or Feruchemist in a single spike (something TLR didnt want to happen) but you wouldnt find a viable Donor/victim anymore. He could always swap them out though. If I were him Id have gone looking for allomantic Gold a long time ago to gain the Compounding trick on healing.