Laia is a seventeen-year-old Scholar girl living under the oppressive rule of the Martial Empire. Following a brutal raid on her family, she seeks out the Scholar resistance and agrees to act as a spy within the heart of the empire's military operations. She possesses a quiet, steady courage, even when surrounded by the constant threat of violence.

Elias is a Senior Skull, an elite Mask-in-training at Blackcliff Academy. Unlike his peers, he secretly despises the empire's violent methods and plans to abandon his military future upon graduation. Because he spent his early childhood among desert tribes, he retains a sense of humanity that the academy has tried to beat out of him.

Helene is the only female Mask-in-training at Blackcliff Academy. She firmly believes in the Martial Empire's structural power but privately thinks the Scholars should face less random brutality. As a highly trained soldier, she is fiercely protective of Elias and completely dedicated to surviving the academy's harsh environment.

The Commandant is the icy, ruthless leader of Blackcliff Academy. Despite her delicate physical appearance, she commands absolute terror from both the elite students and the enslaved Scholars who serve her. She views any form of mercy as weakness and actively roots out dissent with extreme prejudice.

Keenan is a serious, hardened member of the Scholar resistance. He was saved from starvation by Laia's father years ago, a debt that fuels his dedication to the rebel cause. He serves as Laia's primary handler while she acts as a spy, often disguising himself as a tradesperson in the market to pass her messages.

Marcus is a vicious Mask-in-training who thrives on intimidation. He views compassion as a fatal flaw and uses physical force to establish dominance over his peers. His unpredictable cruelty makes him a constant threat to anyone weaker than him or anyone who crosses his path.

Zak is Marcus's twin brother and a fellow upperclassman at Blackcliff. He is noticeably quieter and more thoughtful than Marcus but remains entirely complicit in his brother's violent acts. Zak lacks a strong individual identity, preferring to operate under Marcus's aggressive leadership.

Izzi is a young enslaved Scholar who has lived at Blackcliff for nearly her entire life. She is missing an eye due to a past punishment from the Commandant. Despite her ingrained fear of the Martial authorities, she slowly finds the courage to assist Laia in navigating the academy's hidden dangers.

The Cook is an older enslaved Scholar who runs the kitchens at Blackcliff. Her face is heavily scarred from past torture inflicted by the Commandant after she was caught spying for the resistance. She is bitter, heavily cynical, and suffers from intense physical pain whenever she tries to discuss her past.

Mazen is the calculating leader of the Scholar resistance. He prioritizes the broader war against the Martial Empire over individual lives, demanding strict obedience from his followers. He is highly pragmatic, using Laia's desperation to secure a spy inside the heavily guarded military academy.

Darin is Laia's older brother and her sole surviving family member. He secretly apprentices with a local weaponsmith to sketch the designs of unbreakable Martial steel. His subsequent arrest by Mask soldiers sets the entire story into motion.

Nightbringer is an ancient, mythical jinn who survived a historical massacre by the Scholars. According to legend, darkness falls wherever he walks. He operates in the shadows, communicating with high-ranking Martial officials to enact a long-awaited revenge against the Scholar people.

The Blacksmith is a gruff but sympathetic artisan who formerly taught Darin the secrets of metalwork. Disgusted by the Martial Empire's violence, he refuses to craft their unbreakable weapons, choosing instead to covertly supply arms to tribal fighters and the resistance.

Elias's Grandfather is one of the most powerful and respected Masks in the Martial Empire. He fully expects Elias to dominate his peers and ascend to the highest ranks of military leadership, ignoring the Commandant entirely in his line of succession.