Against The gods

He entered a battle with the gods and was betrayed when victory was within his grasp, but even the gods could not kill him completely, he reincarnates and vows to find out why he was betrayed and get back at the gods, he planned to get stronger by challenging insanely strong people but what he saw utterly disappointed him 'what? the world has been turned to a fantasy? how am i supposed to find strong opponents when everyone seems so comfortable?!'