Han Sen was wary about the idea of going, but he ended up deciding to do as Dragon King pleaded. He decided to go to Ancient Devil Shelter. He didn't entirely believe Dragon King, but the creatures were indeed behaving strangely at the sound of that bell, and they were all headed in the same direction.
Aside from the Devil Fangs, Han Sen noticed many more creatures heading that way, too. They looked possessed, mindlessly going there.
Han Sen was stuck inside that realm, so he thought he might as well go with them to see what was going on and test his luck.
Besides, Han Sen still had firm control of Dragon King, and he did not believe the spirit could do anything to change that fact.
Han Sen flew towards the buildings, far beyond the black mist, and as he was going, asked, "What is that Qi Ling you mentioned?"