An incredibly bittersweet conclusion, but this is one of my favorites and will retain a fond spot on my internal Cosmere works tier list. 

This is Sazed's and Spook's book, their opportunities to go through character arcs that were only teased in The Final Empire and are well concluded and well earned in this final novel in Mistborn era 1. You learn so much more about the world and magic system at large, more about the Shards that built everything, without it getting bogged down with exposition or more details than you need.

Stormlight might be (is) Sanderson's magnum opus, but that series owes a lot to how well Mistborn era 1 is plotted, structured, and executed. And these foundations set in this first grouping of Mistborn novels can help inform how some situations could/do play out in other works (looking at you, Dalinar).