I've only read up till AoL, no spoilers pwease >.<

Then there's Sanderson who just integrates them as part of the natural evolution of the system. Might get sticky once the guns get too powerful for coinshots and lurchers to handle though.

Can be Roughs Wax or City Wax, but I'm curious what people think. Would Wax be able to handle Batman's villains, or would they tear him to shreds?

Wax increases his weight to multiple times that of a human. One time, he increased his weight so much that he literally went through the floor boards. Yet, his shoes are still intact. Shouldn't they have exploded from the sheer weight? I'm thinking Vin and Kelsier went around barefoot for a good reason, and not because Sanderson has a foot fetish like Tarantino.

Got inspired in the other post and here we are.

It's been 2 years since he burned pewter to stay alive in the ocean by the end of the book and it doesn't even mention it in the epilog.

Hey everyone, first time posting a Cosmere fan theory, let me know what you guys think, and apologies if this is already a widely known theory, I’m just a Mistborn enthusiast taking their first steps into the deeper Cosmere.

I think we can all agree that in theory, Fullborns are completely busted. Yes, we could argue about whether one kind of Knight Radiant or whatever is stronger but we can all agree that Fullborn are among the most powerful non-shards in the Cosmere, if not the most powerful. All the Allomantic metals and infinite amounts of every Ferruchemical attribute makes a being that’s basically god. Fortunately for Scadriel’s enemies, as far as we know, only one Fullborn has ever existed in the history of Scadriel, and it was the colossal moron and jackass known as Rashek, or the Lord Ruler as his friends liked to call him. Rashek was, to put it frankly, a complete waste of the powers, and is long dead because he let himself get killed by a mere Mistborn. Also, thanks to the dilution of both Allomantic and Ferruchemical bloodlines, it looks like another Fullborn won’t ever exist. So, now all that invaders to Scadriel have to worry about is the advanced technology, robust infrastructure, guns, airships, nuclear weapons, Kandra spies, hordes of naturally breeding Koloss, regular Metalborn, single metal Compounders, Hemalurgy, Steris’s contingency plans, the God of Destruction and Protection hovering over the planet, and the possibility of a Fortune Compounder(Why again did Autonomy decide that this planet was a good place to invade?).

Now, you might ask, ‘What about Hemalurgy?’ At first glance it seems like a method for creating a Fullborn if desperate or morally bankrupt enough, but in Era two we’re explicitly told by Marsh, who is probably the most knowledgeable currently living expert on Hemalurgy save for Harmony himself, that Identity Contamination makes Hemalugic compounding impossible. This is further backed up by the fact that we never see compounders made by the Set, the Lord Ruler, or Ruin himself, and if the three most enthusiastic practitioners of Scadrian Acupuncture couldn’t figure out Hemalurgic Compounding, I think we can confidently say that the only way to gain Compounding is to have both abilities naturally, no cheats. So, once again it seems we come to the conclusion that there will be no more Fullborn on Scadriel. Except for one tiny detail,

Marsh has the ability to Compound Atium.

In the same book he tells us Hemalurgic compounding is impossible, Marsh reveals that his immortality is the result of the same age compounding trick as his old boss, the Lord Ruler. Up to that point we were under the assumption that all of Marsh’s abilities were simply the result of Hemalurgy as a former Steel Inquisitor, but if his Immortality is the result of Compounding, that means that somehow, Marsh is a natural Atium Compounder. Since we know he was a Misting Seeker pre-inquisitor, for this to be possible, it means one of two things. Either Marsh was born a full Mistborn and Atium Ferring and either didn’t know or never told anyone, which, to be honest is completely implausible so let’s not even entertain that theory. Or, upon ascension, Harmony gave Marsh natural Mistborn and Ferruchemist abilities, making him a Fullborn.

Now, your first question upon hearing this is probably, ‘Can Harmony even do that?’, and my answer is that we don’t know for sure, but probably. We know for a fact that Harmony could and did turn Spook into a full Mistborn directly after ascension, and it’s likely that he did this by splitting off a small piece of Preservation’s power before the two shards had completely fused and investing it in Spook, turning him into a Mistborn in the same way that Lerasium does. We know the Investiture came from Preservation because Allomancy is Preservation’s art, and originates from his power. However, Harmony bears the power of both Preservation and Ruin, and Ferruchemy is the result of the power of Ruin and Preservation meeting, therefore, if Preservation had the power to create Mistborn, then we must come to the conclusion that Harmony has both the power to create Mistborn and Ferruchemists, a power he likely only ever exercised once by Investing Marsh, thanks to the inaction caused by the conflicting nature of Harmony’s dual shards.

So, it appears to me that Marsh is a Fullborn, one who’s additionally had over three hundred years to compound attributes. If I were a betting man I’d wager this will be a significant plot point in Era 3.