Lucia (Octopath Traveler)

Lucia is a villain in Octopath Traveller. She is the final boss in Cyrus's story.

Story
15 years prior to the events of Octopath Traveler, Lucia met Lyblac, and together they plotted to install Yvon as the headmaster of the Atlasdam Royal Academy in order to gain access to the tome From the Far Reaches of Hell.

The two were able to convince Yvon to assassinate the former headmaster so that he might take his place and procure the tome. However, after Yvon was able to unlock the secrets of the tome, Lucia plotted in secret to dispose of him and continue the research herself.

Lucia corrupts Yvon into practicing dark magic and stealing countless amounts of knowledge and power from various sources, and murdering anyone who stands in their way.

Lucia is present during Yvon's reprimanding of Cyrus, and when Cyrus is sent on a sabbatical due to a presumed affair with Princess Mary.

Contacting the evil sorcerer Gideon, Lucia and Yvon commission him to use dark magic to start working on creating the "Blood Stones". Lucia gives the directions to Gideon...to start kidnapping innocents, and spend weeks tortuously starving and draining them of their blood until finally they perish, perpetrating this awful experimentation on dozens of innocents.

During Cyrus's travels, she secretly follows him to Stonegard where she informs him of Yvon's plot to use the tome for nefarious ends. She then guides Cyrus to Yvon's Birthplace, only to render him unconscious and throw him into a dungeon. Before leaving Stonegard, she gives Yvon a flawed blood crystal to use against Cyrus, knowing it would render him unstable and kill him.

Lucia would later appear in Duskbarrow in the Ruins of Eld, where she secretly conducts her nefarious research and hoards priceless tomes. She is confronted by Cyrus, who deduced that she was the true mastermind behind the tome's theft and use. She boasts her schemes and attempts to sway Cyrus into joining her, claiming they both merely want knowledge and to know all the secrets of the world, but he turns her down, pointing out he wants knowledge so he can use it to help people and cure diseases and such, while Lucia wants all the knowledge in the world for herself. Disgusted, Lucia uses a blood crystal, taking on a similar monstrous form as Yvon did, only to be defeated in battle, her own Blood Stone overwhelming and destroying her for good.

Personality
While Lucia has always been regarded as a brilliant individual and possesses ambition for acquiring new knowledge, she is lost in self-interest. She thinks of other people as disposable, and readily forsakes her humanity when her research is threatened. Like Yvon, she does not believe in sharing knowledge for the good of others.