At this point in the story, we can't be beaten physically by any being. So any major villain introduced is going to have to attack the WoL indirectly, and be incredibly deceptive to the point we may actually trust them. It has to be on a psychological level. Mess with our heads. Give us dilemmas. Even if we are the strongest warrior in the universe, we can't be everywhere at once. A good villain is going to understand that.
