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I have a theory of how the FTL would work in the Cosmere, and just wish to share my idea here to see what others think about it. This was found in FanX Spring 2019 (April 19, 2019), for those of you wondering. Now, the Alcubierre Drive functions through the creation of a Spacetime Topology which has space compressed on one end of the ship, and expanded on the other. This works in accordance and does not break Einstein's Field Equations. It is very complicated, so I will not go fully into how they are thought to operate in the real world, but you should already be seeing where I am going. Allomantic Cadmium and Bendalloy both are able to, in a localized area, expand and contract time. This is notable, due to the fact that Space and Time, in General Relativity and other fields, are fundamentally interchangeable. Which leaves on to question if it is theoretically possible that a skilled Allomancer could apply the effects of these Metals to Space instead of Time. Therefore causing Space itself to expand and contract like they do to Time. This would be able to create an effect nearly identical to the Alcubierre Drive, creating a very similar Spacetime Topology. This could be done through some sort of automated, mechanical Allomancy, and mix this with Duralumin and one could further intensify the degree of warping which occurs. This would allow one to go, essentially, faster than light, while remaining in adherence to the Laws of General Relativity on a local scale. This does require negative energy, or a infeasible amount of energy. But this can easily be overcome with Cadmium and Bendalloy being used to bring about the proper curvature and topology. Now, one of the major issues with the idea of this, is heat and energy production with the warping, These show that the Warp Drive would likely produce large amounts of heat, but, theoretically, a skilled Feruchemist could find a way to take this heat production and store it in metals in order to help the people within it not perish due to the heat production. Like with the Warp Bubbles, this could also possibly use some form of automated feruchemy, if something of that sort is ever discovered in the future. This fits with the knowledge Sanderson has of Warp Drives, theoretically can be done with Allomancy, and also does not violate causality, which is an issue Sanderson was aware of with FTL Travel, Further support is in how the Time Bubbles are called as they are, as the are close to the term "Warp Bubble", and the shimmering border and how everything that passes through it being disturbed does fit with the idea of a topological defect like that formed by a Warp Drive. Which, while not significant backing, does help support my point. This does have the issue of assuming it can warp space, but according to physics it should be able to. This does also fit with the idea of Sanderson saying that FTL Allomancy uses concepts and uses of the Metallic Arts we are not familiar with yet, this, I believe, could be in reference to Spatial Manipulation. As he did imply that the Tables are only human ideas of how they are organized rather than some kind of Rule. So it is possible that Cadmium and Bendalloy are not purely temporal. So, what do you think of this theory? Does it sound plausible?

Brandon has said that Era4 will be a clash of cultures. We now know that this will probably involve a Rosharan/Scadrian conflict. And in RoW we’ve seen what may well be its beginnings. So this is what I think will be the heart of the Scadrian/Rosharan conflict. Scadrial is society created by thieves. They revere a conman, Kelsier and venerate am assassin, Vin. They naturally seek the mists, which actively work to conceal Allomancers. They are a society naturally drawn to the shadows. Fighting fair is NOT how they operate. Roshar is the opposite. Knights in literal shining armor, bound to honor codes. The most duplicitous of the Orders revolves around Truths. They’re practically designed for a straightforward fight; you can’t hide if you glow in the dark! I can’t imagine why the Rogue planet doesn’t get along with the Paladin planet... Chaotic Good/Neutral vs. Lawful Good/Neutral... We can see this with the Ghostbloods, which we now know are run by Kelsier. As I’ve pointed out on other threads, they’re on the same side as the coalition - quietly. They want Dalinar to win. But the way they’re doing it (leaving aside the actions of individuals) is not a method most Radiants could approve of. But it gets better. Scadrial is the world most like Earth. It utilizes mechanical industry and the metallic arts. It’s the type of industry that, as we know, can easily scour the land. On top of which, the allomantic and feruchemical arts are internal and intrinsic. And those two combined allow for fairly easy sharing of powers. And then there’s Hemalurgy. The ability to steal any power with the proper training - so long as you’re willing to kill. On Roshar, in contrast, industry is almost entirely Investiture based. And we now know that fabriels can be created by Spren, without needing to harvest resources. On Roshar, industry may very well follow a more symbiotic path; note that much of their nature and their major investiture system is all about symbiosis. The powers so granted, however, are not easily transferred. And while Bondsmiths can more easily manipulate Connection, there are some fairly strict limits (including an inability to travel). Hemalurgy lacks those constraints, being limited only by knowledge and morality. And there are no Oaths to enforce the latter. And what is the Shard of Scadrial? Harmony. What is the hypothesized union of the three Rosharan Shards? Conquest. Honestly, when you look at it, it makes a lot of sense that these two would end up conflicting. The natures of the worlds are inherently opposed.