Grace and Glory by Jennifer Armentrout

Follows the aftermath of Zayne's death and angelic resurrection, the main characters' fight against the Harbinger, and their drastic plan to summon Lucifer to save the world.

This book contains: alcohol, anxiety, assassination/death, assault, body horror, cannibalism (minor), dark content, deception, drugs, explicit sexual activities/nudity, gore, potentially prurient content, profanity, suicidal thoughts, torture and violence.