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.