Gabriel is a thirty-three-year-old paleblood and the last surviving member of the silversaints, an order of vampire hunters. Burdened by the grief of losing his wife and daughter to the Forever King, he suffers from a worsening bloodlust known as the *sangirè*. He relies on his enchanted silver sword, Ashdrinker, and travels with a small band of loyal friends. Despite his gruff exterior and excommunicated status, he fiercely protects the people he cares about.

Celene is a vampire and Gabriel's half-sister. She belongs to the secretive Esani order, a bloodline that practices a unique sacrament called communion, which involves consuming the souls of other vampires. The voices of those she has consumed echo continuously in her mind, creating a chaotic internal struggle. She accompanies Dior on her journey, offering guidance while harboring secrets about her faith.

Dior is a young orphan prophesied to be the Holy Grail of San Michon. As a descendant of the Redeemer, her blood possesses miraculous properties that can heal mortals and burn vampires. She carries the heavy burden of a prophecy that dictates she must unite the five kingdoms to end the perpetual darkness plaguing the world.

Jean-François is a vampire historian and the Marquis of Sul Adair. Under orders from his mother, he extracts the history of Dior Lachance from his captive, Gabriel. He is arrogant and voyeuristic, taking pleasure in the salacious and violent details of Gabriel's confession.

Fabián Voss is the Forever King and the Priori of Blood Voss. He is an ancient, incredibly powerful vampire lord who commands the Endless Legion. Having lived for a millennium, he suffers from deep boredom and orchestrates wars largely to entertain himself. He views Gabriel not just as an enemy, but as a fascinating adversary.

Maryn is the ancient Priori of the Esani vampires. Despite her immense age and power, she is trapped in the physical form of a young child. She serves as the spiritual leader of the Esani order, interpreting prophecies and directing her followers with absolute authority.

Aaron is a former silversaint who was forcibly turned into a highblooded vampire. He struggles constantly against his new vampiric instincts, terrified of harming the mortal husband he loves. He uses his Ilon-inherited powers of mental coercion sparingly, trying to retain his humanity in a world that views him as a monster.

Baptiste is a mortal blacksmith and Aaron's husband. He is fiercely loyal and practical, possessing the rare skill required to perform forge-welds on enchanted weapons. He willingly travels into danger alongside Gabriel's party, constantly seeking ways to bridge the gap between himself and his undead husband.

Phoebe is a duskdancer from the Ossian Highlands, possessing the ability to shape-shift into a lioness. She is a fierce, independent warrior who relies on ancient Highlander magic. She advocates for Dior to seek counsel from the wise women of her people rather than following imperial prophecies.

Reyne is a princess of the Elidaeni court and a skilled swordswoman. She acts as a steadfast protector to Dior, armed with a silversteel blade. Her devout upbringing often conflicts with her romantic feelings for Dior, leading her to enforce strict boundaries in their relationship.

Lachlan is a devout silversaint and Gabriel's former apprentice. He views the world in stark moral terms, believing all vampires are inherently evil. This rigid ideology creates constant friction with Aaron. He is loyal to Gabriel's mission but struggles with the compromises required to achieve it.

Charlotte is Gabriel's cousin and the acting commander of León's forces. Known as the "Ashen Lioness" for ruthlessly burning down infected districts of her city, she is a pragmatic and severe leader. She harbors deep resentment toward Gabriel for the disgrace his illicit birth brought upon their family.

Margot is the ancient Empress of Sul Adair and the matriarch of the Chastain bloodline. She is hosting a Conclave of vampire leaders to decide the future of the empire. She uses her son, Jean-François, to extract information from her prisoners, seeking a political advantage over her rivals.

Kestrel is the "Iron Maiden," a Prince of Forever and the eldest daughter of Fabián Voss. She is a ruthless military commander who leads the Endless Legion in her father's stead. She uses her telepathic abilities to wage psychological warfare on her enemies before engaging them in physical combat.

Wulfric is an ancient Esani vampire and the biological sire of both Gabriel and Celene. He is a strict and fanatical adherent to the Esana faith, demanding absolute obedience from his followers. His consciousness survives within Celene, constantly berating her from the confines of her own mind.

Baron Gerrard is the ruler of León and Gabriel's estranged maternal grandfather. He cast Gabriel's mother out of the city decades ago but now regrets his pride. He attempts to reconcile with Gabriel, offering him a place in the family lineage.

Ilon is the ancient Priori of the Whispers bloodline and one of the first five vampires cursed by the Redeemer. He operates in secret, ruling the city of León from the shadows by lacing the cathedral's communion wine with his blood, placing the entire populace under his mental control.

Prince Philippe is the son of Empress Isabella and a battle-scarred noble of Augustin. As a second son, he never expected to inherit the throne, making him pragmatic about political realities. He approaches his duties with weary honesty, including his arranged betrothal.

Empress Isabella is the ruler of Augustin. She is a stubborn and defensive monarch who initially refuses to relinquish her authority to Dior. She holds a decades-old grudge against Gabriel for his past actions and remains fiercely protective of her remaining family and power.

Joaquin is a liberated thrall who serves as a loyal captain to Dior's forces, known as the Unbound. He provides practical support and combat assistance during their sea voyage and subsequent battles, offering moments of levity alongside the grim reality of their quest.

Laurent is a young, visually impaired mortal pianist who captures Celene's attention during her early years as a vampire. Lonely and confined to his family's estate, he forms a secret, forbidden romantic connection with Celene, defying the strict rules of her vampiric order.