Replying...
Intro. In this world the natural, moral and ethical laws are different, here beings from another dimension invade the world to protect it, the battlefield was created, a space through which they must pass before reaching the world, since then on the same day of each year, young people of age are sent to fight and protect the world and only those who kill these beings can return, by killing these beings they obtain an egg that will become a mestizo and never disobeys the one who raised it, becoming the slave race of the world

First world

@Fen