Change the world of people

In the modern era, the life of human beings was an easy life where all the resources of living existed. You did not have the concept of mana on earth, but it was hit by the card of mana flow in the world. There are those whose body could not bear the transformations of the world and the flow of mana and turned into a zombie. Hatta small ants became 3 meters long, the whole world transformed On our hero Jack, who used to live in the desert with his family