Remnant's extinction:RWBY x cryptid controller reader

There was a young fellow that remembers only his name and nothing else.His name was Y/n L/n he doesn't remember anything of his past but one thing he does know that he's not alone.Y/n had the ability to control alien like life forms called cryptid including their masters ancestors.When Y/n woke up in Remnant and allied himself with the cryptid and withnessed the villans of Remnant there was one thing to his mind.
Their extinction!