Traveling to another world, taking the Demon Queen as his apprentice

After Chen Daoxuan traveled through time, he obtained a system. As long as he accepted a disciple, he would be rewarded. The crit return of the disciple was 10,000 times.
Chen Daoxuan: "Why do the disciples look at me in a strange way recently?"
Eldest disciple Empress: As long as the master gives an order, the disciple is willing to kill everything in the world for the master.
Second disciple Saint: What is the highest realm of the master?
Third disciple Sword Immortal: Damn it, everyone says that I am the world's number one sword genius, but why am I not even one ten-thousandth of the master?
......