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Sergei (セルゲイ) was one of the people that attacked Ram and Rem's village.


Sergei was almost always shown to be calm and composed.


Around ten years ago, Faust, Sado, Sergei, and Fogg attacked the Oni Village. Sergei killed Dudley Miload and confronted Roswaal pretending to be Dudley's follower, though he was defeated by the former and had all four of his limbs broken.


Mana Poisoning: Sergei was able to contaminate the atmospheric mana in the nearby vicinity and make it poisonous. As Oni absorb mana through their horns to strengthen themselves, he was their worst possible opponent. This ability was also effective against mages as it made it harder for them to use the mana.

Explosion Technique (爆裂術式): Seigei was able to use the Explosion Technique, however he admits that he's terrible at it.