The Sunlit Man

Another stellar standalone from the goat.

This book talks a lot about the nature of investiture and covers some of the logic of the magic system found all across the Cosmere. One of the great things about investiture is that it allows the reader to experience wonder and mystery about the “new” magic systems you encounter across Sanderson's work, while also being able to tie all of it back together in an explainable way.

Anyway, not a great starting point if you're new to Sanderson (try Mistborn), but a must read for a fan of the Cosmere.