"The longer you stay away from earth's atmosphere, the weaker the connection of the ability cores become. Mine has already started weakening. And in seven days, the connection will be completely gone."
"And guess what happens when that happens?"
"You lose your abilities?" Lucifer stared at Xaen.
"No. Your ability cores become a ticking time bombs them. They start exploding inside your body, killing you in the most brutal way possible. And guess what? Same time will happen to you if you stay away from earth for seven days or longer."
"Your body will become a nuclear bomb, destroying everything around you, including yourself. So if you want to know the location of the stones, you must take me back to earth every seven days. Not only that, but you must also go there every seven days."
"You're bluffing. How can you know all this?" Lucifer asked, not taking all this information at face value.