Kostoria Arzenon

"I hate myself. My craving. It's shallow, it's ugly, it's stupid. But like a thirsty heart, I can't always quench it. What I really wanted was this prosthetic eye. It's the only thing that makes me normal. It hides the Magic Eye of the ugly beast."

- Kostoria to Anos Voldigoad

Kostoria Arzenon (コーストリア・アーツェノン) is one of the Lions of Destruction of the Disaster Abyss World Evezeino.

Appearance
Described as a fine-looking girl with braided hair and beautiful prosthetic eyes. She wears a gray uniform with skulls on her shoulder and the Pablohetara emblem on her chest.

Personality
Kostoria is easily annoyed, hotheaded, unpredictable, and stubborn. Her primary craving is envy. She envies what others have and she lacks but admires it at the same time. She has a great deal of self-hate and deep down searches for something genuine.

History
Like Naga and Bobonga, Kostoria was born as an imperfect Lion of Destruction. While most of her phantom demon body is intact, Kostoria herself has no eyes because that's the part she received from the Phantom Beast. To incarnate properly, Kostoria and her "siblings" must tear into the womb of the Princess of Calamity and return to the Disaster Abyss of Craving, where they have to incarnate their missing body parts.

Silver Water Holy Sea Arc
Not long after the Militia World became visible, Kostoria and Bobonga head there to find the Princess of Calamity and discover Izabella, her current incarnation. When Bobonga is captured after attempting to kill her, Kostoria appears and fires a magic bullet, prompting Anos to shield his mother with Beno Ieven. However, the barrier is suddenly replaced with the magic bullet, which explodes. While Anos manages to protect his mother, Bobonga escapes and rejoins Kostoria. The two get ready to leave, but Kostoria realizes that Anos took her one of her prosthetic eyes. Anos crushes the eye, but she doesn't fall for the provocation and just leaves with Bobonga.

Disaster Abyss World Evezeino
Kostoria meets Anos again after he secured a high rank within Pablohetara. She tells him about the baptism ceremony, where he has to beat the deep world students in a contest of replicating each other's magic to pass. Eventually, only Anos and Kostoria remain, as the others could not use Egil Grone Angdroa. But she loses as well when Anos uses Venuzdonoa. Despite summoning it perfectly, the sword still stabs her due to its unreasonableness. Rather than answering his questions as they agreed, Kostoria commits suicide by breaking Zecht, but Anos revives her through Agronemut. Seeing how pointless it would be, she tells him about the Princess of Calamity.

Anos would later meet with Naga and learn that the three siblings are under the absolute control of Dominic, who made them attack his mother. However, a dispute on how to deal with Dominic leads to a Silver Water Hierarchy War between the worlds of Militia and Evezeino. Kostoria fights Sasha Necron, who is wielding Venuzdonoa, so she copies it and the two swords clash. By using the lion's eyeball to attack Sasha from behind, Kostoria manages to knock out Venuzdonoa from Sasha's hand and seemingly kill her. However, Sasha is unscathed because she destroyed the logic of being slashed, and then she slashes Kostoria. She also exploits Kostoria's craving of jealousy and taunts her, causing her to get distracted and be swallowed by Naga's magic.

Abilities

 * Magic Eyes of Transcription: This magic eye has the ability to copy any magic with a single glance, even if said magic is beyond her scope of ability. However, she doesn't get to keep said magic and only has it for a limited amount of time. She has to look at the magic again if she wishes to duplicate and use it once more. In addition, the duplicate is slightly inferior to the real thing.


 * Immense Magic Power: As a Lion of Destruction, she possesses a huge amount of magic power. Most of it was concentrated in her missing eyes.

Equipment

 * Arzenon's Claw (アーツェノンの爪): A red claw belonging to the Lion of Destruction. All imperfect incarnations of the lion possess it in order to tear into the womb of the Princess of Calamity and return to the Disaster Abyss of Craving. It takes different forms depending on the user.
 * Lion's Parasol Claw Vegalve (獅子傘爪ヴェガルヴ): Kostoria's version is able to transform into a weapon resembling a parasol combined with a lion's claw. She can cast magic from the tip of her parasol, usually magic bullets.

Anos Voldigoad
Kostoria deeply resents Anos for stealing her prosthetic eye, the only thing that made her feel normal. She vowed to steal his most precious thing and destroy it in front of him.

Trivia

 * Kostoria means "eye" in the language of Phantom Beasts, symbolizing her status as the eye of the Lion of Destruction.
 * The nickname Koze that Anos gave her is an old magical word in Militia that means "righteousness". It's a name he wished for her, a beast who acts out of craving, to at least be human.