House of Flame and Shadow by Sarah Maas

Stranded in a new world, Bryce desperately seeks to return to Midgard while Hunt remains imprisoned by the Asteri, as their world faces potential collapse.

This book contains: activism, alcohol, alternate gender/sexual ideologies, animal cruelty (mentioned), anxiety, assassinations, blackmail, body horror/dismemberment, cannibalism (referenced), dark content, death (including animals), deception, divination, domestic abuse, drugs/addiction/drugging, emotional abuse, gore, hate/discrimination, human trafficking, misogyny, obscene sexual activities/sexual nudity, oppression, potentially patently offensive content, potentially prurient content, profanity, rape/sexual assault (referenced), self-injury (blood ritual), self-sacrifice (attempted), smoking, slavery/ colonization, stealing, torture (graphic), toxic relationships, violence (significant), and war.