Mische is a former human acolyte of the sun god Atroxus who was forcibly turned into a vampire. She carries painful burn scars from attempting to use her sun magic in her new undead form. After being sentenced to execution, she is spared to assist Asar on a dangerous mission into the Underworld. She approaches her grim circumstances with persistent optimism and deep empathy for others. Despite her vampiric nature, she remains fiercely loyal to her sun god and constantly seeks his validation.

Asar serves as the Warden of the Morthryn prison. As the illegitimate son of the Shadowborn King, he carries a fearsome reputation as a spymaster. Thick, luminescent scars mar his face and chest, and he sees through a cloudy silver eye. He uses forbidden necromancy and shadow magic, but his harsh exterior hides a protective nature and a desire to heal broken things.

Atroxus rules as the sun god of the White Pantheon. He expects absolute submission from his followers and views mortals as tools for his divine objectives. He exploits Mische's desperate need for his approval to assign her a secret, conflicting task during her journey into the Underworld.

Chandra spent decades locked in the Morthryn prison before her death. Asar resurrects this elderly human acolyte of Atroxus to serve as a backup for Mische on their dangerous descent. Chandra represents the ideal, unwavering follower of the sun god and views vampires with strict religious disdain.

Saescha is Mische's elder sister and a former priestess in the Order of the Destined Dawn. She deeply feared vampires and sought to protect her younger sister during their difficult early life. Her tragic memory heavily influences Mische's current motivations and fears.

Eomin is a mortal boy from Mische's time at the Citadel of Destined Dawn. He and Mische spent their youth studying magic and exploring the grounds together, developing a close bond that Mische refused to act upon due to her religious vows.

Malach was a Shadowborn Prince who forcibly turned Mische into a vampire before she eventually killed him. His cruel actions in the past created deep, lasting trauma for multiple characters within the House of Shadow.

Raoul is the King of the House of Shadow. He is mentally declining, often confusing the present day with long-past events and forgetting the deaths of his own children. He possesses powerful mind magic but struggles to maintain his grip on reality.

Egrette is a Shadowborn princess who uses mind magic and compulsion to interrogate prisoners. She is ambitious and eager to win her declining father's favor by presenting him with the culprit behind her brother's murder.

Elias is a loyal guard in service to Princess Egrette. He is assigned to accompany Asar and Mische into the Descent, though he harbors intense skepticism about the safety and true purpose of their quest through the Underworld.

Luce is a large, wolf-like dog who was Asar's childhood pet. After she was killed, Asar used necromancy to bring her back to life. She serves as a loyal guide and silent protector for Asar and his companions in the Underworld.

Ophelia is a former vampire noble who shared a life with Asar. Her tragic murder by Malach devastated Asar, driving him to attempt forbidden necromancy in a desperate bid to save her.

Alarus is the fallen god of death who was murdered and dismembered by the White Pantheon. The primary mission of the narrative involves traveling through his Sanctums to gather his scattered relics for a resurrection ritual.

Nyaxia is the Dark Mother and the primary goddess of vampires. She seeks to resurrect her fallen lover, Alarus, and uses her divine authority to command Asar's perilous journey into the Descent.

Esme is the former warden of Morthryn who held the position for nearly three hundred years before her execution. She now exists as a relatively harmless spirit who trained Asar and continues to care for his well-being.

Raihn is the Nightborn King who previously befriended Mische after she was forcibly turned into a vampire. He views her as a sister and offers her support during her difficult transition into vampiric life.

Oraya is a companion to Raihn and a close friend to Mische. Through correspondence, she attempts to keep in contact with Mische during her struggles with her new vampire identity.