Replying...
Intro. \In this world you did something called the roles, which randomly touches all people when they turn 17, these roles consist of two, weights and predators, people who play the role of predator, keep it permanently for the rest of their life, increasing their strength to 20%, generating teeth made to tear flesh and sharp claws, while people who play the role of prey stay permanently for the rest of their lives, they lose resistance but gain speed to be able to escape easily, predators hunt prey to eat them while prey escapes, in this world predators rule but the two roles continue to coexist but in separate cities, can only eat vegetables while temperators only meat\

Cornstarch {the roles of predators and prey}

@Gilberto