The Shadowed Sun by N.K. Jemisin
ALL TIME FAVORITE RIGHT HERE
This is book 2 from the Dreamblood Series. Book 1 was a banger. Book 2 might have been even better.
I'm not going to spoil anything below, except for basic world-building aspects you learn pretty early on. (though! If you wanna read this book, you should let the book do the worldbuilding and skip my description)
So anyway. We are in an egypt-esque setting (but not on Earth), where magic is real, and it centers around dreams.
There are three types of priests, sanctioned by the Hetawa (the religious institution in Gujareh), each wielding different forms of this dream magic.
Gatherers enter someone's dream, find their soul, and help it travel to Ina-Karekh - a realm of dreams created by the goddes Hananja. Gatherers are derisively called assassins, the the people of Gujareh, whom they serve, mostly do not feel this way. When Gatherers ... gather someone, they collect Dreamblood - one of the four dreamhumors.
Sharers use Dreambile (from bad dreams), Dreamblood, and the other two dream humors (I don't remember them!) to heal people who come to the Hetawa. They can mend broken bones, treat serious psychiatric disorders, and recover someone to near 100% as long as they're not actually dead. They also can fix cuts and scrapes and treat sad moods and grief.
Sisters give people climactic dreams, which generates another one of the dreamhumors, which they collect, give to Sharers, and Sharers use for healing.
Both books deal with a reasonable amount of politics, tension between the noble class and the Hetawa. The character development is excellent. The worldbuilding is excellent. It's a Jemisin book, c'mon. It's great.