The Pee Fah needs to possess a host in order to live, and only leaves the host's body when the host is asleep. Before the host dies, the Pee Fah must find a new host in which it can reside, and that is achieved by inducing the new victim to consume saliva from the old host. These ghosts are powerful and fearful, and if one succeeds in entering someone, it will possess them for life, feeding on the intestines and blood of human victims.