Nothing

Kill three corpses. The corpse insect is called Peng Hou. It is inside the human head and makes people stupid and devoid of wisdom. The corpse insect in the middle is called Peng Zhi. When it is in the human chest, it makes people have troubles and delusions, and they cannot be at peace. The name of the corpse insect is Peng Jiao. When it is in the human belly, it makes people covet men and women for food and drink. In this world, practitioners who kill three corpses are everywhere. If you want to kill three corpses, you must first raise three corpses. The only way to nourish a corpse is to nourish a corpse with a corpse. Practitioners who raise corpses make mortals stupid. Practitioners who raise corpses make mortals full of desires. Practitioners who raise corpses may make people hungry, thirsty, or addicted to beauty. So, in this world, crazy people can live, lust slaves can live, cannibals can live, bloodthirsty people can live, and greedy people can live, but mortals cannot live. The so-called human beings are nothing but beasts that walk on two feet.