"Huh?" Xu Que wasn't quite sure that he had heard that correctly.
Jiang Hongyan was also slightly astonished, and both of them looked at Lord Zeng.
Lord Zeng shook his head and chuckled, "Did you two think that you could return to the Four Great Continents with this Immortal Hall? You can't. The reason why you could travel here from the Four Great Continents was that back then, the Xuanzhen Continent had not activated its Sky Formation. Once the Sky Formation is activated, it would seal off all the voids within the Xuanzhen Continent, preventing enemies from invading and also stopping people from within the Xuanzhen Continent from leaving!"