The cultivated Fourth Rank spirit beasts are not limited to just one.
Hence, it's not hard to deduce that there must be some special item within the Valley of Ten Thousand Demons that specifically assists Demon Beasts in breaking through to the Fourth Rank form.
One must know, for a Demon Beast to break through to the Fourth Rank is a qualitative leap, and on some level, it's even more challenging than for a cultivator to break through to the Nascent Soul Realm.
If the Rat Demon could obtain such an auxiliary item, then the likelihood of its breakthrough to the Fourth Rank form would undoubtedly greatly increase.
Seeing Xu Ping's reaction, Gu Yuntao showed no surprise.
After all, he knew the other party had a Rat Demon that had just broken through to the Third-rank Upper Grade.
"Fellow Daoist Yan's spirit beast has already broken through to the Third-rank Upper Grade. Given some time, if you could establish some relationship with this Valley of Ten Thousand Demons."
