The Might Of An Oni
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After throwing a rock into the Oni's forehead for talking too much, the young demon angrily roared back at me, raising his club weapon. His eyes seemed to suddenly turn bloodshot red, as if he was activating his Berserk Mode. Usually Demons would only activate them when they were damaged already, the more damaged they were, the stronger they would grow.
This is why one had to quickly finish off a demon instead of letting them stall for time. However, this Oni seemed capable of unleashing his Berserk Mode out of pure rage, a special trait that Onis have, who are a natural race of demons who belong to the Ogre-class and are good at going berserk and smacking everything on their way.
They certainly lack any finesse in their ways of fighting, and techniques are null, they only abuse superhuman strength and the infusion of demonic energy into their bodies to fight. However, that would be more than enough for him to kill every single person in this group with ease.