Arkarium

Story
A faithful servant of the Black Mage, and according to the Silent Crusade, his right-hand man.

He first appeared in the Demon Slayer Storyline. During a meeting with the Demon Slayer, himself, Von Leon, and Orchid, Arkarium mentioned they burnt down the Demon Slayer's hometown and killed his family.

Upon learning that the Demon Slayer gave Mastema a letter to deliver to the Heroes, Arkarium attacks her and leaves her for dead. She transforms into a cat in order to survive, looking for a way to revert her form and regain her powers.

When the Demon Slayer tries to confront the Black Mage, Arkarium stops him. After a scuffle, Arkarium attempts to use an all-out attack until the Black Mage's doors open, inviting the Demon Slayer to his throne, and Arkarium leaves.

During the Silent Crusade Storyline, Arkarium created several Mystic Gates and empowered many Master Bosses (ie- Timer, Zeno, etc). He finally entered the Leafre of Past through a crack in the Temple of Time and attempted to unseal his master. He was then stopped by a Mapler, although it turns out that this Arkarium was a decoy and the real one vanished to the Dimensional Shicism. In an expedition, he was finally defeated once and for all.