Acting Tough in Another World.

Guy gets reborn in another, has no power what's so ever, in a world where everyone else has power. "So what if I don't have power at the moment? With my system I shall rule the world!" System is locked "Huh?" What? I should write a better synopsis? Who has time for that? On hold because I'm off to save the world from hostile Extraterrestrial, Vampire Nazis, And evil Radioactive Space Wizard Ghosts.