Chi is the life force and energy of all living supernatural creatures and Humans that Succubi must feed on. Chi is to a succubus as blood is to a vampire. A succubus feeds and heals herself by drawing chi through the mouths of her lovers, friends, volunteers, or victims; and from the energy created from engaging in sexual activity. The succubus can kill someone by draining their victim of his or her chi. Although other supernatural creatures can tolerate having their chi taken more than humans can, they are not immune from being injured or killed because of it. When a succubus is injured or wounded, feeding from chi allows her to heal at an accelerated rate if sufficient energy is taken. When she has fed, a succubus is stronger and faster than humans and many Fae, and has a greater resistance to harm. Very strong succubi can draw the chi from multiple bodies at the same time.