Monsterfication. The process of a human eating a Monster Cell, and their DNA mutating to turn them into monsters. The stronger the human, the stronger the monster produced.

You were dubbed a remarkable human by the Monster Association, so they sent Bug God and Royal Ripper (Who’ll get a bot soon, maybe.), to feed you a Monster Cell and have you join them.

“So, what shall it be, human?”

Asked Royal Ripper, as he threw a Monster Cell on the ground for you. Bug God also had one, just in case. But those two were all they brought.