I was thinking of all these things I've heard
about "spirit vampires" or "vampiric spirits."
How the spirit of a vampire is different from other spirits
and goes around taking hosts to drain others of energy
I'm going to try to fit this in with two different versions.
Either it can fit with the myths,
or it will fit with reality.
In mythology a vampire is generally either undead or immortal.
mythological undead, being dead,
would not likely have a spirit
nor would they require hosts.
Immortals, being creatures that live forever,
may have a spirit,
but would still not require a new host.
So it doesn't look like they fit into mythology very well.
Now for reality.
In reality a vampire is a being
with a flaw in the flow of their energy,
a being that is incapable of producing enough energy,
or must for whatever reason take energy from an external source.
being pure energy,
would not have this problem
since they would not need to produce it
nor would they have a physical body for it to flow through.
So logically speaking a "spirit vampire" would not be possible.
Consider it a myth that has been busted. :D