What is a person's real power? Well, that's a set of things like their power level, race, special abilities, and skills.
Those points are variable, but what most impacts during combats is the power level. People with significant differences in their power levels will have a very fast fight, while people with similar power levels will have a long and balanced fight.
But after seeing Lucien, a likely demon, theoretically from the Earth Realm, not only fight equally with someone from the late stages of the Sky Realm but also beat him up, he still kills, or rather, destroys, ten Earth Realm angels with a single strike, while also stepping on the head of that Sky Realm angel.
That scene is not only brutal but also impossible. The other angels, both from the Mortal and the Earth Realms, go into shock and get terrified.
"What is he???" Many of them wonder.
"A monster!! He can only be a monster!" One of the strongest angels among them speaks while his legs are shaking.