"I suppose there are cultivators who would do it for revenge as well. However, most ghosts do not have the sense to be able to work together or plan attacks. Some are only able to travel in a straight line. Revenge is a waste of time once the offending creature has been dispatched."

"It is hard to tell the numbers, but there are enough of the four types that cultivators are rarely without a job. Spirits come from living plants and animals, demons from humans, ghosts from the dead, and monsters from dead plants and animals. Spiritual energy in life plays a part in whether the dead can return as does unfinished business. Those without training rarely leave their villages or houses once the sun sets."