What does it mean to go against evil spirits in chapter 1669?

This means that divine power will be restored.

In the ruins of Phoenix in mainland China, the hero of "Evil God" inadvertently absorbed the evil blood of his daughter Yun and recovered his strength. By using the blood of evil spirits, Che Yun reached the highest peak in mainland Tian Xuan and came to the celestial world. As a result, he was countered by people from heaven, seriously injured and died frequently. Later, he returned to mainland Tian Xuan, where he was healing at the Phoenix ruins.