How to hatch the devil's eggs: We can open the backpack first, then find the stones of the prop fans in the backpack, and then give them to the demon guardian. Then the stone is considered as a demon egg by the demon guardian, and then the dialogue continues. Then, open the backpack and click on the devil's egg to show the hatching progress. Besides, giving Xue Jing to the devil's egg will speed up the incubation. If you want Xue Jing, you can find the last four bosses and beat them to get Xue Jing.