I honestly feel like humans should've been powerful in the Highschool DxD supernatural world at some point... I mean more than 7 billion people and no one can kill a Maou or Arch Angel or a Cadre? Come on! Imagine if a race called "High Humans" existed. They had broken thru a normal humans limit in one way or another, for example: Intelligence, Strength, Speed, Endurance, and things like that! But then one day all the other factions teamed up on the humans... and so the other factions became myth to normal humans and the angels that tried to help the humans became fallen angels... this all happened after God's death...