This was a powerful conclusion to a powerful trilogy. While describing it to my dad, he asked if it was fantasy or science fiction, and I hesitated. At the beginning of the trilogy, it was clearly fantasy, but I like how it morphed into science fiction by the end. It's a world totally remote from ours and yet sharply analogous in the ways that matter, as in this quote from the preface that blows me away with its truth:
"Some worlds are built on a fault line of pain, held up by nightmares. Don't lament when those worlds fall. Rage that they were built doomed in the first place."
-The Stone Sky by N.K. Jemisin