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The Immortal God Civilization was faced with only two options: either to help the remnants of the Buddhist civilization let go of self, purify themselves before they completely fell into demonic degradation, or to obliterate the remains of the Buddhist civilization and the demonic civilization.
The second option was naturally the path most desired by the Immortal God Civilization.
An enemy that is dead is a good enemy after all.
Despite the constant assaults from the Immortal God Civilization, the demonic civilization and what remained of the Buddhist civilization continued to endure, making it impossible for them to be eradicated swiftly.
The crisis of the "Age of Dharma Decline" loomed as well.
Thus, the Immortal God Civilization had no choice but to take the first option: to assist the remnants of the Buddhist civilization in relinquishing and purifying themselves.