Death

"I-I don't understand," Ely said. "Didn't you already come back from there once before? Why is it goodbye this time then?" 

"That's because… when we kill Jha'Akim, the force from the explosion will destroy the wormhole and there will be no way for me to return back," Ning said. 

"Are you sure? Maybe it won't, there's no need to say goodbye right now, right?" Anya asked worriedly. 

"No, I'm sure," Ning said. "Because that was exactly what the system said would happen as well." 

"No, please. I'm sure there are other ways," Ely begged. 

"Master, if you're going, then take us with you," Night spoke up from the side as well. 

"I can't do that. Outside of this place, you will just be a normal beast with a limited lifespan. I won't be able to take care of you at all," Ning said. "Besides, you guys have a family now, you belong somewhere. I can't keep you with me all the time."