Regressor in the apocalypse

Regressor in the apocalypse-
Have you ever dreamed about an apocalypse and how would you conquer it well most people talk about a zombie apocalypse or nuclear apocalypse but no one expected it to be none of those.
Tall creatures of all variants suddenly appeared around the world and monsters straight out of the fantasy world like goblins and so on and a game-like screen appeared in front of every human after they kill a monster without using gun or things like that, to give them a chance at survival.
After a couple of months, the world population dipped to 2 billion and humans began eating each other after the population dipped to 1 billion they started eating the weaker monsters and the remaining scientists realized that the humans were gaining more chromosomes and it was from the monster they have eaten and after the average man gain 100 Chromosome from any type of monste his strength would go up and after 500 Chromosome he would start to evolve as part of a hybrid monster or would be a human with unimaginable destructive power there was a 50/50 chance.
But Max didn't take any of the benefits the humans was given and hid like a dog and only survived for a couple of months.