It starts with a universe. Then, it grows into hundreds, thousands of planets, sprawling all across the multiverse that was created from this one tiny universe. Billions of years pass. Humans start doing amazing things. But there must be someone to stop it, someone to protect the many multiverses. So the gods created men so powerful that they lived outside any multiverse. Then, they gave them the power to change these worlds, save them. They are called Healers. (Original book about what happens when humans become sub human, essentially.)