[ not a lot of things are know about demons, very few facts about them exist apart from the few obvious ones that we've discovered that has made them so feared. They're not creatures of Mana or Qi, they have no traces of the elements that make up both fundamental energies of earth, or even a trace of any of the sub energy sources. No spirit, no prana, no chakra, nothing at all but life malevolent and corrosive energy of the darkest form.
There are very few demons with extreme strength, we imagine that the way of life in their world is extremely brutal, and for you to be an extremely powerful demon, you would have to climb up a mountain of corpses, visiting death everywhere you go and turn. Or you have to be born strong, to be lucky to be amongst a special breed; but then again such power and strength would still be baptized in a lifetime of Carnage and bloodshed.
