Lightlark by Alex Aster

Secretly powerless Wildling ruler Isla Crown enters Lightlark's deadly Centennial contest to break her realm's curse. Navigating treacherous alliances, dangerous romances, and shocking betrayals, she survives the deadly trials to finally claim her true magic. 

This book contains: alcohol, alternate gender/sexual ideologies (referenced/minor), anxiety, body horror, bullying, cannibalism (contextual), dark content, death/grief, deception, divination, explicit sexual activities/nudity, gore, murder, non-sexual nudity, sexism, toxic relationships, and violence.