Vampire blood ingestion

[Haprenti]

How about a new spell, Vampire purge.

Regurgitate any chems in your blood stream at a small blood cost

I was thinking about something like that. Rather than regurgitating it entirely, it should increase the depletion rate of harmful/all chemicals for a few moments, with the option to increase it more at a greater blood cost.

For the holy water abuse, add a natural/blood costing ability to sense holy things (like holy water) that would warn the vampire about to suck blood from someone filled with holy water.
I guess that's what real vampires would have.