After taking all the treasures, he let go of those universal realm masters to their respective universe with a forceful warning.
He placed a soul exterminating seal on their soul to control rather. Of course, he would not give every instruction to them but if they go against his Will, then if he gets the word, they'll.
Fei was still between the void. Before sending them away, he let those universal masters from their universe wait.
From the original six, demon, beautiful lady, and virgin youth were from another universe, while the other three were from this universe. He let Jack and Jane leave with those two universal masters.
Since it was his command, they simply couldn't refuse. They knew his ruthlessness and when they found Johnny was his son, they took care of him specifically in the way.
