"Some vampires who claim to be psi-vamps,
use their mind and body energies
to manipulate the life energy they absorb to a purpose. This
often includes controlling humans and, reading minds, and
generally getting what they want out of life. Most vampires can
do these things, so they could all be classed as psi-vamps as few
actually drink blood and even they seem to psionically absorb the
life force within the blood. Psi-vamps seem to become a little
more energised by draining/contact, but they experience none of
the benefits of the blood. Physical enhancements do not occur in
psi-vamps. Merely an overall rush and/or emotional enhancement.
True there are generally exceptions to the rule, but I haven't
found them yet. I have found haem and psi vamps being in the same
person. That is to say - one person being both. This is more what
I perceive the 'real' vampire as being. One who gets an emotional
rush, able to drain will/emotion, manipulate a subject and drink
from a subject to glean the enhancements that the blood brings. I
still think that while there are emotional and perhaps other
mental highs associated with the psi-vamp, I am trying to see a
manner of sustaining life and enhancing physicality with
psi-vampirism. There may indeed be something more non-corporeal
involved - another elusive fact I suspect. I would be interested
to note if there are any life-sustaining or physical-enhancing
properties to purely psi-vampirism. I have found that psi-vamps
are energy/emotion drainers. Also manipulators. Whilst they are
not so much a vampire in the traditional sense, they do exhibit
vampiric behaviour only in as much as to take 'sustenance' from
another. As a matter of fact some psi-vamps actually manipulate
situations so that the emotional high can be sustained and/or
brought on so that they will have something to feed off.
- Damien Daville, Vampire Church