Heroes Die by Matthew Stover is possibly my favorite book of all time. Really interesting premise (the characters are "actors" sent to a parallel fantasy dimension to live out adventures that are recorded and experienced first-hand by those in the "real world"), brutal, gritty, full of action.
Hugely recommend The Acts of Caine series to anyone who loves dark fantasy.
https://www.goodreads.com/series/537...-acts-of-caine