Mugen no Skill Getter! - Ch. 36 - Erst Decisive Battle

[demonslender]

Yeah based on the established rules of this world with levels and all that, there is no reason for this demon general to survive one hit. There just isn't.

Normally I would agree but experience plays a huge part in battles regardless of level. But also the story tells us that the former hero mistook this demon for the demon lord because of how unbelievably powerful he was and that they could only beat him by sealing him away after countless sacrifices. The story is telling us exactly how badly the mc is gonna lose by having rushed into this battle thinking that a higher level is all that matters.