...is "Oathbringer"

Book recommendation: The Stormlight Archive (series), by Brandon Sanderson. Sci-fi/fantasy.

Warning: these books are extremely long (each book is well over 1000 pages), and deals with loooads of characters and complicated plots.

BUT.

These are my favorite books I've ever read. 

I just finished the 3rd book, Oathbringer. What I loved about it is that each main character deals with huge mental health problems, which makes the story super real. A king suffers from horrifying PTSD, a soldier deals with depression, another person deals with schizophrenia, a another with drug addiction, someone else has extreme self-loathing... you get the idea. The author doesn't come right out and say "okay and now it's time for the chapter about depression," but very subtly exposes details about their issues little by little until you figure it out.

If you like the show Lost, you're the kinda person who would dig these stories because seemingly unrelated details or characters end up being super connected, the plot is revealed very slowly (yet action packed), you delve deeeep into character flashbacks, cliff-hangers galore, and it alllllll comes together at the end of each book giving you the most satisfying book endings of all time, while leaving you begging for more (which is quite the feat since these books are so stankin long!!).

The best part of these books are that it made me FEEL. Book one literally starts off about a suicidal slave forced into brutal labor in a war. Rock. Bottom. He grows, and you grow. When he struggling with moral dilemmas, the author paints the story so well that I found myself struggling with the dilemma as well, instead of being like "well duhhh you should choose A instead of B, clearly that's the just thing to do."

It's dang good stuff. Definitely not for everyone, but I'm a nerd and a sucker for sci-fi/fantasy stuff and was straight up hooked.