Sylvester made the opening in space, which appeared like a crack in glass. It was small, only large enough to let him in. However, he put more care into it than ever since his existence could possibly inflict harm upon his home reality.
'The First Pope was forcibly rejected by reality because of his increased power. I'm far beyond that point at this stage.' Sylvester remembered and gently entered with alertness, trying to feel if there was any sort of pushback.
One leg, then the other, followed by his entire body. He didn't dare appear directly inside the home universe and instead went to Nehilius' realm that was connected to the door in the Pope's Palace basement.