The Strongest Demon Emperor Development System

A top killer on earth traveled through time with a demon emperor training system that contained the supreme demonic way. Kung Fu? I have the demon to refine the body; I have the elixir to refine the weapon; I have the blood to refine the soul; the talisman? I have various talismans accumulated over thousands of years in the demon world. Since we have become the enemy of the world, let us fight happily! In the fairy world, wouldn't it be great to break up a demon world alive?