I don't believe they are that powerful. [ Not enough might to devastate dimension after dimension after dimension after dimension. He would not believe that even there is a chance that could be true. They were not that strong. They had limits surely. ] It is one thing to appear omnipotent in this Tower of souls—this environment is their playground; to pull elaborate illusions here would be child's play for them. But it's another for them to be that powerful outside a place where they are in complete control.