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. Behind her nature, Kostoria has the character of a daughter that her mother wants to be seen as existing. Where he only wants to go home if his mother is also with him.

History
Kostoria was born from Dominic Arzenon's latest attempt at incarnating Arzenon's Lion of Destruction, the strongest Phantom Beast in existence. Like Naga and Bobonga, Kostoria is 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 inherited from the phantom beast.

To incarnate properly, Kostoria and her "siblings" must tear into the womb of the Princess of Calamity using their "claws" 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 Arc
Kostoria meets Anos again after he secured a high rank within Pablohetara. She tells him about the initiation ceremony, where he has to beat the other students in a contest of replicating each other's magic to pass. By the end, only Anos and Kostoria remain, as the others couldn't use Egil Grone Angdroa. However, she loses as well after replicating 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 to continue, she tells him about the Princess of Calamity.

When Anos is taken into questioning for Fallforal's destruction, Kostoria uses this chance to attack Izabella using the deep magic she learned during the contest. She defeats Eges Code with a copy of Venuzdonoa, but she stops when Parrington Anessa comes to Izabella's rescue.

During the 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

 * Immense Magic Power: As a Lion of Destruction, she possesses a vast amount of magic power, as it is stated a a Lion of Destruction is easily capable of laying waste to a entire countries in deep-class worlds. She demonstrated enough power to fight against Lay, who was wielding Evansmana and later easily contend with Sasha, who has the power of the Goddess of Destruction, being greatly superior to her in terms of overall magic power.

Magic
See: Magic


 * Magic Eyes of Transcription
 * Egil Grone Angdroa
 * Likness

Equipment
See: Items


 * 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. The claw also has a second form, which changes depending on its user.
 * Lion's Parasol Claw Vegalve (獅子傘爪ヴェガルヴ): Kostoria's claw 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.
 * Venuzdonoa : Kostoria was capable of duplicating Venuzdonoa with her Magic Eyes of Transcription, as was demonstrated during her baptism match against Anos, and later, in her battle against Sasha.

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.

Two-Laws Tyrant
While Kostoria thinks that she is acquainted with the Two-Laws Tyrant, she is unaware that the Two-Laws Tyrant she is interacting is Anos in disguise, who took the identity as a favour to the latter's butler: Roncruz Zeybat.

She initially sought him out due to wanting to know about the latter's world, and if it contained an Abyss.

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.
 * Most of Kostoria's magic power is concentrated in her missing eyes.