Throne of the Fallen by Kerri Maniscalco

This is the 2nd book in this series. Prince Envy finds his demon court under attack from a strange curse, and the only way to save it is to win a complex, perilous game orchestrated by the Unseelie King.

This book contains, abandonment, alcohol, animal cruelty (minor), assassination, BDSM, blackmail, cannibalism (minor), dark content,
death, deception, dubious consent, gore, kidnapping, obscene sexual activities/sexual nudity, potentially patently offensive content, potentially prurient content, profanity, self-injury for blood drinking, sexism, sexual assault, suicide, torture, and violence (graphic).