Tribulation.

You Xi Wang took out a set of clothes from his space ring and rushed outside the cave. He removed all the barriers on his way as well. He came outside the cave opening to see that the sky outside was rumbling loudly. The whole landscape was shaking with vibrations. Maya had been standing outside the cave, she said, "Brother Wang, did you not pass only one step?" 

She may be a beast but she had all the knowledge regarding cultivation from the others. Before they came here, You Zhichi had told her the basic process of the nirvana rebirth cultivation. She did not mention a heavenly tribulation. Thus, Maya asked the question. 

You Xi Wang sighed and said, "Holy Spirit energy cast my new skin and vessels. This is anti heaven so the tribulation came to test me." 

As they were talking the system spoke, "Your family is coming you better tell them not to come closer or the tribulation will become nastier."