When everyone else was at their wit's end.
Ye Chenfeng was rapidly communicating with Old Bai and Old Hei.
Although Ye Chenfeng's expertise in formations was quite good nowadays, his current strength was limited. To set up a defense formation so strong that even those beyond the Heavenly God Realm couldn't break it, he'd need at least ten days and a large number of spirit stones and heavenly treasures. Thus, setting up a defense formation was indeed not a feasible approach.
Old Bai said unequivocally, "Young man, the buildings in this ancient city have been reinforced by special energy. According to me and Old Hei, the buildings here can't be destroyed by ghost cultivators. You just need to shut the doors and windows well and prevent those ghost cultivators from entering."
