Glister

In this suspenseful portal fantasy, thirteen-year-old Qadira is faced with the reality that to be queen, her eight siblings must die. Decreed by the Ahmaran deity that only one heir can live to ascend the throne, Qadira is forced into a sudden fight to the death with her siblings to see who will rule. The problem? She doesn't want to kill anyone.
But when she accidentally causes the death of one of her siblings, all sights are turned on her as the most dangerous threat. With all the heirs coming at her full force, she makes an unexpected ally-a disembodied voice that whispers terrible things and promises her survival and eventual queenship if she releases him.
Despite how much she wishes to escape, she's stuck in the palace with magic and blade-wielding siblings seeking her death. It's only then, with death whispering in her ear and tragedies manifesting in everything she touches, she realizes there is only one truth: she either kills her siblings and lives to become a murderous queen, or she lets herself be killed in hopes her soul will have peace.