Sithe Leaders power in main universe
I am curious why the Sithe Leaders powers would be reduced if he were to enter Ji Ning's universe? I get that when people enter a universe they weren't born in, they get rejected by it's dao, but wasn't the Sithe leader born in the original universe? He is technically not from any of the current universes, shouldn't he be accepted by all of them or rejected by all of them? Or is it that he has now bound himself to a universe, so the other universes reject him?