When Wu Yu arrived in the Demon Immortal Realm, the Buddha Above All, Xuanzang, also did as he was in Wu Yu's Apotheosis Realm.

However, Xuanzang suggested it would still be better to return to the Expanse of Nirvana for cultivation. On one hand, the spiritual qi was denser in the Expanse of Nirvana. On the other, the Demon Immortal Realm might be discovered by the Jade Emperor if he recalled he once' invaded the place. 

If that happened, it wouldn't be as easy for Wu Yu to escape to the Heavenly Buddha's Domain.

In fact, the Jade Emperor might even find out the existence of the Heavenly Buddha's Domain when the Immortal Domain Bridge was opened. Then, the Heavenly Buddha's Domain would be in a perilous state.

The Immortal Buddha World Core was now damaged,...