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Sounds extremely inefficient and the claims of renewability are debatable.
It would come down to chasing bottlenecks blood would be a three first problem most likely then how fast can you really produce effective holy water also if you aren't careful about exhaust then you could end up with vampires escaping as dust
I wouldn't think you would need exhaust —should be a contained system, unless I'm missing something.
However I'm seriously skeptical about the power density of vampire regeneration.
Would a vampire be able to regenerate with even the force required to turn the engine?
And how long does regeneration take?If they where laying down it might be more efficient then it would be closer to just changing the air pressure
Can increase efficiency by using a pope-compatible person to supply both blood & holywater