谢尔盖was one of the people that attacked拉姆and蕾姆's village.
性格[]
Sergei was almost always shown to be calm and composed.
背景[]
Around ten years ago，福斯特，萨德，Sergei，and佛格attacked the Oni Village. Sergei killed达德利and confronted罗兹瓦尔pretending to be Dudley's follower，though he was defeated by the former and had all four of his limbs broken.
能力[]
玛娜 Poisoning：Sergei was able to contaminate the atmospheric 玛娜 in the nearby vicinity and make it poisonous. As Oni absorb 玛娜 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 玛娜.
爆裂术式（爆裂術式）：Seigei was able to use the Explosion Technique，however he admits that he's terrible at it.