Weltall

As mentioned, there are several locations where we're probably or definitely going to get stories which will feature new worlds and new magic. In addition to the works already mentioned, we have a place called Vax that Ati and Khriss have both referred to and we have Silverlight, which may not have any native magic systems but it's definitely a location where we could see all sorts of magic diversity from worlds that might not get books of their own. Even of the worlds we've already seen we've got plenty to learn, take Sel for example, given how Investiture works there we've got tons of potential new magic systems to see. Actually, at least one more is implicitly guaranteed by the fact that there's a third great empire on the planet which must have at least one regional magic of its own and probably lots more since Fjordel and the Rose Empire both feature multiple magics within their borders. Here it is. Whether that's still the plan or not is anybody's guess. He described them as all having 'significant' influence from the Shards and while Threnody certainly fits that bill given what we know now, First of the Sun might not.

Brandon has said that it's assumed Adonalsium created humans (and possibly the other sapient races... or everything) but Brandon has RAFO'd whether this is actually the case. None of the worlds (except maybe Taldain) currently have the combination of scientific method and excavation technology to do the kind of research that they'd need to realize that they didn't evolve naturally on their worlds, though Rosharans probably would have eventually figured it out on their own even without the Eila Stele. Renarin for example notices that some animals humans keep don't fit into the rest of the ecosystem. Yolen is directly named as the first world in Arcanum Unbounded and mentioned without being named by Khriss in Mistborn Secret History, along with the implications when she describes how Yolish lightweaving is the 'original' version of that magic. There's also at least one other planet in the Cosmere besides Scadrial which is inhabited now but which was not at the time of the Shattering.

Nah, I think it's okay as it is, just something to remember in the future.

I do agree that a Nalthian with Breath would remain in the Cognitive Realm longer before passing Beyond but I don't think it's going to be for very long. Normal Scadrians (who have innate Investiture from Preservation and Ruin) sometimes only hang around for seconds before they go and even a mistborn doesn't get more than a few minutes. I think Breath makes a difference because we know Drabs can't Return and I suspect the reason is that Endowment doesn't have enough time to speak to them, show them a vision of the future and make them the offer before they go Beyond. But Breaths are kind of weird in that they're more Physical than Spiritual (they can't be stolen with hemalurgy for example) so I don't think having a lot of them will make a whole lot of difference to how much time you can spend before passing Beyond. They remain with the body though, which is why the amount of Breath that Arsteel had made a difference when his corpse was Awakened. Flat no. Nothing comes back from the Beyond, even the Shards don't understand it and Brandon is deliberately not canonizing anything about it, leaving it to in-world philosophers and theologians and to us the readers to decide for ourselves. FYI, when people die they appear in the Cognitive Realm, not the Spiritual. There is a sort of 'echo' that remains in the Spiritual Realm which has to do with that realm being timeless and involving all the Connection past, present and future, but what stays there isn't the self, which goes Beyond.

Welcome to the Shard! Not only do the Metallic Arts have the means to enable FTL travel built into them but other Cosmere magics do as well. The final Era of Mistborn (which is also ging to be the finale for the whole shared universe) is a space opera and will feature multiple worlds and according to Brandon, really cool space battles. Roshar has magic that allows control over gravity and a form of teleportation, Autonomy's Investiture can theoretically power a solar sail and Sel has at least two magic systems featuring teleportation that could be extended to interplanetary or interstellar travel in theory, once they work out the geographic limitations. As for your observations about speed bubbles, we've had lots of discussion on how allomancy might work to produce FTL but Brandon has been clear that he hasn't given us enough information yet to come up with the answer for ourselves. Here's him describling how the application and understanding of magic is going to grow as we move further along the timeline. In other words, for Scadrian FTL at least it's going to be more complicated than just using the powers we already know about in the ways we know they can be used.

Brandon has ten books planned, with a solid division into two five-book arcs. We're on book three. Of course he's got tons of worldbuilding material already outlined and just waiting for the proper time to introduce it. Also, welcome to the Shard!

It would depend on what you're spiking yourself with, I think. When it comes to stolen allomantic and feruchemical powers you're stealing just the bit of spiritweb that controls having a given power and a bit of Identity, which I assume is universal even if it's only confirmed for feruchemy due to getting access to the donor's metalminds. If you were stealing something like physical strength or mental power from a donor with a particularly weird spiritweb it might be possible it messes yours up more than normal. But just having a cracked spiritweb isn't going to do anything bad to you because by definition, anyone with magic to steal via hemalurgy already has some sort of crack in their spiritweb.

Not quite, Nightblood is one of the most heavily Invested things that isn't a Shard but there are some things that are more Invested, including at least some Perpendicularities. That quibble aside, you're right.

Except that we know spren can be freed from gemstones and if the knife trapped Jezrien's entire Cognitive aspect, the possibility exists for that gem to be broken and then he'd be free. The WoB states quite clearly that he's 'extra dead' which makes much more sense if you assume that the knife only stole the bit of Investiture that was binding him to the Oathpact and keeping him from passing Beyond. No possibility of returning again that way because once he went Beyond nothing could bring him back and it would do exactly what Odium wants with less work. Brandon has also been rather loose with the use of the word 'soul' at times and I think more weight should be given to the 'extra dead' part of that WoB than the 'soul' part..

Yeah, Khriss even mentions in Arcanum Unbounded that hemalurgy has the broadest implications because of its ability to steal things from anywhere and 'create false Connections that no Shard designed or intended'. Actually, almost all Cosmere magic can be used on different worlds, as long as you satisfy whatever that system's requirements are. The Metallic Arts are the generally the easiest to use offworld since all you need is the right metal and it doesn't have to be metal from Scadrial. Other magics might require you to bring along the necessary materials (like needing Invested sand from Taldain to do Sand Mastery) or find an appropriate hack that lets you use elements of one magic to power another, but most magic is effectively universal as long as you know what you're doing. The only exception we know of is Selish magic, which is region-locked and can't be used too far from the location on the planet where the magic is practiced and can't be used offworld at all, currently. Pretty much impossible really. Their actual body sublimates when they Ascend and the representations of them that we see in the Physical and Cognitive Realms are just projections. Plus, a spike can only hold so much Investiture and the amount you'd get from even a tiny fraction of a Shard's power would break that limit and probably do weird things.

We know that Spiritual travel is possible. Oathgates use some version of it and Brandon's current conception (not yet canonized) is that humans got from Ashyn to Roshar via the Spiritual Realm rather than the Cognitive. Point to point transportation that doesn't require the user to walk through the Cognitive also exists, which pretty much requires the Spiritual. This ability is implied of Elsecallers and seen in Elantris.

I'm now imagining how Brandon could make it work within the kind of magic he writes and his own tendency to avoid gratuitous sex. How about kissing then? Brandon's totally okay with writing that, magic in a kiss is an old concept and I'm sure there could be some sort of Intent-based way to determine what does and does not count as a 'first kiss' for purposes of the magic which makes it more powerful than any subsequent use. Maybe different kinds of kisses cause the magic to do different things depending on cultural constructs, like kissing someone's hand transfers Investiture from you to them to give an effect like tapping a metalmind, kissing on the forehead could be how healing is triggered... there's a whole potential magic system just waiting to be written here. xD

Case in point, a character (who shall remain nameless because this is the Mistborn forum but I'm sure everyone knows who I mean) in Stormlight Archive sees a particular vision of the future. Every single vision they've had prior to this point has come true. This one... doesn't. Another character makes a conscious decision that's different than the vision showed and as a result the future in that vision never comes to pass. That vision might have been the most likely outcome of all the circumstances leading up to that point but it wasn't set in stone. Brandon has made it very clear that future-sight in the Cosmere is imperfect. Preservation himself tells Kelsier that even at his best it was difficult to tell what was merely likely to happen (meaning that even he couldn't see what would happen with certainty) and he's clearly very good at future-sight.

Tin savant versus Seer = One dead savant. Slightly enhanced reaction speed due to those senses isn't going to do anything to split your atium shadow. If you also had A-Pewter and/or F-Zinc and some combat training you could potentially replicate Vin's trick but the increased senses alone aren't going to help much against the guy who can see what you're going to do in the future, including your (slightly quicker than normal) reactions to what the Seer is doing.

She might have. Despite the narration saying that she tapped 'everything' Brandon has said that she actually didn't, but she may well have included F-Chromium in her tapping in a 'hey, this might be useful' impulse along with tapping obvious things like F-Tin and Steel. But yeah, echoing everyone else, between the raw power she had, her academic understanding of the Metallic Arts, her recent practice with medallions and how she wasn't doing anything super-complex, I don't think there's much explanation needed for how she was able to do what we saw.

Nah, it's the exact same effect that Vivenna experiences early in the book and Brandon explicitly parallels the two since the one is meant to foreshadow the other. It's actually something he borrowed from Mythwalker, the unfinished book that's essentially Warbreaker Prime with a dash of Way of Kings and Mistborn for good measure. There's no reason to think that Vasher did anything different, especially since we see him performing the Command. Also, he doesn't have a lot of Breath at that point, just fifty or so. Now, we know it's possible to perform some kinds of Awakening on yourself since Vasher tells Denth he knows Commands that could 'make him forget' and we see him do this with the priest's daughter earlier in the book. She must have been doing it on herself because Vasher tells her words to repeat back to him and tells her she has to mean them when she says them, obviously a Command. Then Vivenna sees her aura flicker slightly as she's speaking, so it looks like she used a tiny bit of her own innate Breath in the process. There is however no indication that you can perform Awakening on someone else.

Brandon has indeed confirmed this. And a longer explanation here

Well, Ash flipped out and fainted and considering that all of them can feel the exact same thing, they're all very aware that someone just found out how to truly kill them. I suspect most of them are going to be very worried now. Kalak's might be the worse since his Herald insanity seems to be hypochondria or paranoia and neither of those are going to react well to the news, especially the latter...

What, jump into Roshar too? But think of how tragic! it would be. Most of the wildlife consists of disgusting crab things with seventeen legs, those highstorms would positively ruin her hair, no ice cream...

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The latter and more precise WoB is considerably newer so it's safe to assume it controls over the older blanket statement that 'he's immune' and it fits with what we see in Oathbringer where just having a Nahel Bond doesn't completely shield you from the influence of the Unmade.

Welcome to the Shard! There's a limit to how much Investiture a given body can hold. Nightblood for example (one of the most heavily Invested things that isn't a Shard) is so 'full' already that you couldn't make it into a hemalurgic spike, and it's orders of magnitude below the Investiture capacity of a Shard. There's no way you're getting the infinite power of a Shard into a finite piece of metal. Also, Vessels don't really have a Physical body once they Ascend (the body sublimates because it can't contain the unthinkable amounts of Investiture being poured through it) and the projections they can create to interact with the Physical Realm aren't really them, just an image. There isn't really a body you could spike to steal anything.

I meant in the sense that he didn't consciously know about hemalurgy or what the spike in his chest did and was manipulated by Ruin into spiking himself. I probably should have been more clear there since, as you say, completely unintentional hemalurgy is impossible.

While it would be hilarious for Vivenna to be hunting Nale under a perfectly valid legal justification (to the extent those could apply in interstellar terms) and playing on our assumptions like that would be a very Brandon thing to do, it helps to bear in mind that we know that Vasher is the one who brought Nightblood to Roshar.

Yep, plenty of different places to stick spikes that we know of, even without needing to know the precise (and impressive) number of possible bind points. Most spikes seem to go in the torso rather than the limbs, whether it's Inquisitors, unintentional hemalurgists like Zane or the ranking members of the Set. You'd lose a chunk of potential bind points with a limb but still have more than enough to turn yourself into a hemalurgic pincushion if you wanted to.