This chapter opens with a warning that the arrow is too dangerous to continue, and that the hole in the wall is too deep for the arrow to travel through. The hole is so deep that it will not be able to reach the stingers of the hornets, so they have to drop down into another tunnel. The bug that they have just run into is a wriggler bug, which will lay its eggs on the cultivators and then use them to incubate its eggs. They can only kill the bug with poison, but it is very deadly. The poison is called wuzi vine, and it can drive the bug away, but the poison is so deadly that ordinary cultivators cannot even resist it. The river beneath the mountain is as big as a river.