Xu Feng flew through the air for about a day, finally arriving outside a secluded valley.
The moment he entered the valley, he felt an extremely pure and dense concentration of heaven and earth spiritual energy.
"This can only be emitted by a Tier 4 spirit vein, and it feels like it might be even stronger than a Tier 4 Lower Grade. It seems the strength of Yuhua Palace should not be underestimated."
Chapter 548