"So the guardian spirit of the Azure Forest is your sister?"
Yino was startled by the tree spirit girl's call of "Sister," and he turned to look at Liuli with a strange expression.
In the game, Liuli had used the Full Moon Cult's dark array to corrupt the Ancient Tree Spirit. Because the tree's life force was connected to the entire Azure Forest's ecosystem through the seal, its corruption triggered chaos throughout the forest, leading to heavy casualties among the righteous cultivators who came to investigate.
In the original timeline, Liuli's actions had their own logic. The Ancient Tree Spirit's corruption created weaknesses in the Azure Forest's barriers, allowing Full Moon Cult cultivators to invade and begin their slaughter.
The combination of righteous cultivators' deaths and the cult's invasion led to the second volume's ultimate outcome - the entire Azure Forest becoming a sacrificial feast for the Mother Goddess of the Full Moon Cult.