Mistborn could have found a way around one of its best character deaths, but the fantasy series was right to keep it permanent. Despite taking place in a world with a metal-based magic system, powerful deities, and many other fantastical elements, the Mistborn books take a realistic approach to mortality. Era 1 doesn’t hold back on the gruesome impact of the Lord Ruler’s reign, nor does it shy away from the losses that accompany any war. The Final Empire, The Well of Ascension, and The Hero of Ages all feature major character deaths, driving home the stakes of the story.

https://screenrant.com/mistborn-books-vin-death-permanent-good-after-kelsier-op-ed/