At this moment, Lin Chen had just returned to the Jade Cauldron Sect when he discovered the sky above Cloud Sky City flashing with lightning and rolling thunder clouds, clearly a peculiar phenomenon triggered by someone breaking through to the Nirvana Realm.
However, those heavenly thunders could not pose any threat to anyone below because there was a powerful Formation around Cloud Sky City, the Thunder Magical Formation, specifically designed to absorb the Power of Heavenly Thunder.
The falling thunder instead strengthened the Thunder Formation of Cloud Sky City.
Zhou Xiaoyun was currently looking surprised, partly because the one who broke through in Cultivation, Xu Ma'an, had only advanced to the Nirvana Realm, yet he seemed so exhilarated.
However, Zhou Xiaoyun did not know that the strength of the Nirvana Realm was the highest level of Cultivation within the Jade Cauldron Sect.
