Xiu had already sensed the fatigue of the alliance army. If this continued, the alliance army would be defeated by the Devil race.
Therefore, he made the decision to retreat at the critical moment and handed over the heavy responsibility of resisting the Devil race to the protective shield of Sun Never Sets.
They could not hide in Sun Never Sets forever. The Devil race would break the protective shield one day. If they were to fight again at that time, there would be no room for negotiation in the Forsaken Land.
With the war of attrition as the foundation, the Devil race's forces would be continuously depleted, and then the Devil race would be further depleted through battles. When the alliance army needed to rest, it would be the time to test the defensive shield of Sun Never Sets.
The devil army wanted to chase after them, but they were blocked by the defensive shield of Sun Never Sets.