Is there a smell associated with it? What color mass? Any feelings to go with it? Spirits (not ghosts they don't like ghost) are energy. They expel energy in their actions and need energy like we need food. I believe they draw energy from any source they can such as batteries, many investigators have equipment failure due to premature battery drain, way premature. I feel they also draw it from us and certain emotions are better than others energy wise. Love and hate seem to be the top end, many levels of each, positive, negative and associated with good and bad, Holy and Satanic. It would appear My theory on The Magnetosphere comes in as it seems to store intense emotion such as battles. Perhaps there is a high energy level in lesser residuals such as a car wrecks and others to be replayed as conditions allow. Spirits needing negative energy will do what? Try to scare you of course! That tingling sensation we feel is energy! Same with deep love, all agog in love emits energy as well.