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Rielle was born to Countess Ystride de Caulignont, a pious woman devoted to Halone. When it came out that her father was a heretic wanted by the Temple Knights, one who had been partaking dragonsblood for years, Ystride came to view her daughter an abomination due to inheriting traits of her father's heretic blood. She had her locked away in a windowless cell until her plight came to the attention of Sidurgu and Fray, the latter of which was ultimately slain by Temple Knights in a trial by combat. Having inherited Fray's soul crystal, the Warrior of Light was eventually sought out by Sidurgu, who believed he could not look after Rielle by himself, though he was not initially aware of her relationship to Ystride.
Seeking to understand why the Temple Knights' deemed her an abomination, they sought out a Vanu Vanu shaman to examine her aether. The shaman could only mention a "great spirit" dwells within her, before being interrupted by another contingent of Temple Knights. Unsure of what the shaman meant by "great spirit," Sidurgu decides to contact the experts: the Seedseers of Gridania. After safely escorting Rielle into the Black Shroud, they meet with Brother E-Sumi-Yan of Stillglade Fane. The padjal concludes that she has properties similar to that of elementals - or perhaps, Dravanians - thus explaining her aptitude for conjury. Sidurgu is taken aback by the suggestion she might have partaken dragons' blood, though she denies having ever done so or accused of it.
Following up on the Seedseer's words, Sidurgu decides to consult one of the dragons themselves. The Warrior of Light introduces them to Vidofnir, who directs them to a dying dragon in Mourn. The female dragon claims her beloved's spirit resides within Rielle, though concludes the girl did not acquire it willingly. Sidurgu realizes that the Temple Knights will never give up pursuit given this information, and wishes he better understood the "flame in the abyss" to protect her. Before they leave, the dragon mentions that the "tiny beings" who live in the Churning Mists know a better way.
Returning to the Forgotten Knight, Countess Ystride confronts them and issues her ultimatum: either submit to a trial by combat or she will have the tavern burned down. As Ystride leaves, Rielle calls out to her mother. Sidurgu is angered that she never revealed this detail after all this time. With time running out, Sidurgu eventually decides to consult the enigmatic moogles the dragon mentioned. Arriving at Moghome, he and the Warrior of Light are tasked with cryptic chores while Rielle stays with them. Rielle eventually confronts Sidurgu on his motivations: that he only protects her because it is an excuse to kill the Temple Knights. He realizes he wasn't being honest with himself.
Eventually, Ystride summons them to the Coerthas Western Highlands for the trial by combat. Near the frozen Banepool, the Countess reveals her disdain for her daughter when she remarks her resemblance to her heretical husband, and believes killing her is the only path of absolution in the eyes of Halone. Sidurgu, Rielle, and the Warrior of Light fend off waves of Temple Knights, until Ystride is forced her hand. Ultimately bested in combat, she declares she will never cease hunting her daughter down. Rielle realizes her mother always loved Halone more than her own daughter. As Sidurgu prepares to deliver a killing blow, Rielle issues last rites for her mother, hoping she'll find peace within the Fury's halls.
Rielle appears in several instanced battles as an Ally NPC, where she will heal the player using conjuration magic.