Odessa is a princess of Quentis who is forced on a grueling overland journey across the continent of Calandra. Separated from her husband, Ransom, she prioritizes the safety of her young charge, Evie, above all else. She is compassionate but resourceful, slowly learning to read old journals to find answers about the magical threats hunting them.

Ransom is the crown prince of Turah who operates under the secret identity of the Guardian, a fierce warrior protecting his kingdom. He is infected with Lyssa, a magical blight that grants him enhanced combat abilities but threatens to consume his self-control. Desperate to reunite with Odessa, he disobeys his tyrannical father's orders to search for her across the dangerous continent.

Caspia is a princess of the Starling royal family on the continent of Kenn, gifted with the ability to see prophetic visions. Driven by a mystical pull known as the ritus and a desire to avenge her sister, she defies her aunt's orders and secretly hires a ship to cross the ocean. She is determined, inquisitive, and willing to challenge the traditional boundaries placed upon her.

Andreas is a nobleman from Quentis who has distanced himself from his family's political expectations to live quietly. After finding Caspia injured and alone, he nurses her back to health and teaches her the local language. He becomes her guide and protector, showing a willingness to abandon his own comfortable life to aid her quest.

King Cross is the calculating and pragmatic ruler of Quentis and Odessa's father. He views his children primarily as political assets and maintains tight control over the information flowing into his kingdom. His secretive nature creates a tense environment for Odessa when she returns seeking safety and support.

Evie is a young girl carrying severe trauma after witnessing a brutal attack and the apparent death of the man she believes is her father. She travels under Odessa's fiercely protective care, clinging to a bloodstained shirt as a physical reminder of her loss. Despite her fears, she displays quiet resilience on the dangerous journey.

Xandra is Caspia's cousin and a fellow Quiescent of the Starling bloodline, deeply anxious about whether she will ever experience her magical coming-of-age. She stows away on Caspia's hired ship, driven by loyalty and a desperate need for validation. Her impulsive nature contrasts with Caspia's more deliberate approach to their royal heritage.

Brother Dime is a Voster priest who uses his magical authority to manipulate Odessa's movements after the crux attack. He leverages Odessa's need to protect Evie to ensure her compliance, insisting that the grueling path he chooses is intrinsically tied to her dynasty.

Brother Skore is a Voster priest who wears pale blue robes rather than the customary burgundy. He possesses terrifying magical abilities, including the power to drain blood from monsters in mid-air. He forces Odessa to use her sensitivity to magic to help him locate a hidden object in a dangerous cave system.

Thora is the white-haired, star-tattooed leader of the Mavins, a band of indebted mercenaries. She projects a hardened, pragmatic exterior, claiming to only care about the payment Odessa promises her group. However, she possesses a strict internal code and commands absolute respect from her fighters in the field.

Mae is Odessa's half-sister, residing in the Quentis castle. She harbors intense jealousy toward Odessa, believing she herself should have been the one chosen for the prestigious Sparrow marriage. She frequently uses petty aggression and physical intimidation to express her resentment.

Zavier is Ransom's cousin who previously acted as his body double. Gravely wounded during the recent crux attack, his survival is a major source of anxiety for Evie, who views him as a father figure, and for Odessa, who cares for him deeply as a friend and protector.

Cathlin is a white-haired woman and Ransom's trusted traveling companion. She helps Ransom piece together what happened to Odessa and is sent back to Ellder to manage the political fallout and watch over the wounded while Ransom hunts for his wife.

Jodhi is a dark-haired member of the Mavins mercenary band. He is highly skeptical of Odessa's warnings about the crux migration and frequently mocks her to test her resolve. Despite his abrasive personality, he is a capable fighter who strictly follows Thora's orders.

Mathias is a member of the Mavins mercenary group. Like the others, he is bound to a man named Salem, having been forced into service to protect his mother. He proves brave during a massive monster attack in the skeleton forest.

Queen Oleana is the matriarch of the Starling family who raised Caspia after her mother departed. She enforces strict laws forbidding travel across the ocean, prioritizing the appearance of strength to deter political rivals. Her authoritarian rule prompts Caspia to flee in secret.

Kos is a young orphan surviving on the streets of Skanshon. After Caspia sees him in a vision, she and Andreas track him down and rescue him from a grim life in the slums, eventually taking him with them to Quentis where he receives an education.

Faxon is the head librarian at the Quentis castle and Andreas's former tutor. He is a scholarly, gentle man who provides Caspia with access to restricted texts and a safe space to conduct her secret historical investigations.

Faze is Odessa's pet tarkin, a small and loyal creature that travels with her through the dangers of Calandra. He frequently acts as a comforting presence for Evie and occasionally helps distract attackers during ambushes.

Margot is the Queen of Quentis, having worked her way up from the castle laundry. She maintains a tense, formal marriage with King Cross and projects an icy exterior, though she shows surprising warmth toward Evie.

Alore is the brilliant head healer of Quentis. Odessa entrusts her with dangerous alchemical journals and infected blood samples, hoping Alore can secretly synthesize a cure for the Lyssa blight spreading through Ransom's veins.

Brother Nold is a Voster priest who secretly meets with Caspia in the Quentis library. He reveals crucial, suppressed history about the origins of his people and the Starling ancestors, confirming that his magic causes Caspia physical pain due to her lineage.

Hain is a Voster priest who wears pale blue robes and seeks to break his ancient magical bonds to Calandra. He communicates with Caspia by suppressing his magic, guiding her to uncover the dark truth about the revered magicians known as the Six.