Yiriku Merewen

Yiriku Merewen is the secondary antagonist of The End of Spellcasting. He is the brother of Jiriku Merewen and a former minion to Terminus.

Spoilers below this line

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Originally born to Hans Merewen, Yiriku became impoverished and needy. So he sold himself for experimentation. This granted him dexterity and additional strength, as well as new abilities and dexterity.

But there was a price to pay. He eventually became Terminus' slave. He took upon the identity of Balthazar and began working for Terminus.

He murdered Merle Ambrose and later attacked and murdered all of the wizards at Kiriko's festival.

After that he murdered all the ninjas in Doctor Hu's house.

Eventually, when Jiriku faces Terminus at the end of Episode Ten in The End of Spellcasting. Yiriku kills Terminus and switches sides.

He eventually becomes passive, protecting Jiriku as much as he can.

He makes an additional appearance in ''The Rebirth of Spellcasting. ''Subject B is about to attack Jiriku Merewen, when he intervenes and has a long, drawn out shootout with Subject B until he won.