As previously stated, psychic vampires have the ability and need to take the prana, or life energy from other people. Psychic vampires have a deficit energy system that fluctuates wildly. They tend to run from deficit to overload very quickly, and have a constant need for additional energy.
All psychic vampires are strong energy wielders. They have the innate sense of the energy all around them, and can sense the energy in others very strongly. Most psyvamps find the taking of energy very pleasurable. The process of doing it is simple enough, just focus on the energy and concentrate pulling it into you usually suffices. The sensation is usally experienced as a pulsing as the energy flows into you. Weak psyvamps need to be physically close to their "victim" in order to feed, but more powerful ones can do it from quite a distance, like over the telephone. All that is required is some sort of mental connection. Psychic vampires can draw energy from any source, from crystals, the earth, water, white light, etc, but these sources generally cannot fill the energy need of the psyvamp. Some of you reading this may be wondering what would happend if you were fed on by a psyvamp. Most people experience a slight feeling of disorientation, or dizziness. Most generally feel tired afterwards. Many people report feeling a chill or a coldness. There is no long lasting harm done to the person fed off. There is of course some exception to this. A person who is continually fed off of for a long period may become severly weakened and ill. If people become drained from being fed on for a long time over a long period there is the risk that they can become so weak they might die.
Most psyvamps look for people who are very hyper or angry, because their energy level is very high but also because feding off them is feeding off their excess and unlikely to tire them much. It is my belief that most psyvamps avoid people who are ill, or are depressed, as that energy is both low and negative and may harm the victim. Additionally most avoid the elderly as their energy level is usually quite low.