Brandon Sanderson’s The Alloy of Law is a sequel of sorts to the Mistborn books, but not a direct one. The Mistborn books were set in an original and novel epic fantasy setting; The Alloy of Law takes that setting and advances it into the Mistborn equivalent of the Old West. The magic system is still there, just as it was, but now it’s integrated into a world with trains and revolvers and sheriffs out on the frontier.
I liked this book a lot—more even than the original Mistborn trilogy, probably because it was less grimdark. The only caveat I’d offer is that I don’t think it ends. Sanderson has no apparent plans for a sequel, so I guess he intended the ending to be the full ending, but there are too many open questions at the end for my liking. Still highly recommended.