Mistborn: Secret History is a companion story to the original Mistborn trilogy. As such, it contains HUGE SPOILERS for the books Mistborn (The Final Empire), The Well of Ascension, and The Hero of Ages. It also contains very minor spoilers for the book The Bands of Mourning. Mistborn: Secret History builds upon the characterization, events, and worldbuilding of the original trilogy. Reading it without that background will be a confusing process at best. In short, this isn’t the place to start your journey into Mistborn (though if you have read the trilogy – but it has been a while – you should be just fine, so long as you remember the characters and the general plot of the books). Saying anything more here risks revealing too much. Even knowledge of this story’s existence is, in a way, a spoiler. There’s always another secret.
“I?” the man said. “I am a drifter. A miscreant. The flame’s last breath, made of smoke at its passing.”
This was… everything. Absolutely everything. This is what I have been waiting for for a while. This is what I’ve needed to help piece together more of the Cosmere. This is what is going to keep me from going insane. This explains what I was missing from Allomancy. This explained some of the idiosyncrasies that I noticed but dismissed while reading the trilogy. This..will have to be reread at a later date. Probably multiple times. Definitely multiple times.
This is not something to read before you finish the trilogy. In fact, I am telling you now to not read this at all until after you complete the trilogy. It is a shame this got published 8 years after the trilogy ended. However, it is also good read this after the Bands of Mourning in the Alloy Era, too. You should read it both at the end of the trilogy and at the end of Bands of Mourning. You’d get different things out of it by reading at both of these points.
If you are a fan of Mistborn, if you are a fan of the Cosmere, you have to read this. This is not something that you can actually skip thinking it is just a silly novella. Read it, you won’t be disappointed.