The conversation with the residual thought of Xuanyuan Ya revealed many things to Fang Lin and resolved many of his doubts.
Especially the secrets of the Demon Clan's Sacred Tree piqued Fang Lin's interest. According to Xuanyuan Ya's speculation, whether in this era or in the future era of the Nine Countries and Seven Seas, the First Generation Demon Saint might always be attached to that Demon Clan's Sacred Tree.
In other words, Fang Lin might have come into close contact with the First Generation Demon Saint, but at that time, Fang Lin was relying on the power of the Sacred Tree to repair his physical body, so he didn't feel it at all.
The fact that the Mountain Tu Ancient Spirit has four incarnations also added a layer of invisible worry to Fang Lin's heart.