Kinda based on the exchange I had with @0nelittlebirdtoldme, I thought I might as well talk a bit about how I handle vampire biology in certain regards. This is very much rooted in what we see in Castlevania, though I am gonna hold to those rules in my other stuff too (so both for DnD stuff, as well as original vampire stories).
This is one of the things we know about the Castlevania vampires, but that I like in general. Vampires as I write them can eat normal human food - it just does not give them any nurishment. So, they can eat it for the pure enjoyment of food, but when they are starving it does not do anything for them.
Of course, people would say: "But shouldn't their digestive system be specialized on digesting blood?" To which I say: "A human sized being could not sustain itself on blood alone. So, it is magic. Either way it is magic. So..." *shrugs*
But... While vampires can consume alcohol, they can no longer get drunk because the food does not get properly digested - hence the alcohol never enters the bloodstream.
Vampires and their own Blood
Okay, folks. Here is the thing. I know that the general consensus is that vampires have no blood on their own. But, well... They kinda need to have that. Especially if like me you wanna write some nice hot smut. Because here is the thing: No blood. No boner. No blood. No wet pussy. Both things depend on blood being there. So, yeah, they need blood.
Also it should be noted that basically in all vampire media we still see vampires bleed. Which I find kinda funny in Baldur's Gate, where there has been so much effort in thinking through how bloodlessness would affect Astarion's look. Yet... We see Astarion and the other vampires bleed, which they cannot do if they don't have blood. (Duh.)
Vampires and Regeneration
My vampires can regenerate normal wounds by taking a moment to focus on them. To put it into TTRPG terms: They can regenerate by taking one round of concentration on them. Which makes it a bit harder to regenerate during combat, but outside of it, it is rather easy. Though obviously it takes a bit longer to regenerate bigger wounds.
There is however some limits. Magical wounds cannot be healed like this. While they will still usually heal faster than with a human, they cannot just regenerate that kind of damage within minutes. Also it takes energy to regenerate. So if a vampire is hungry and has not fed in a while they regeneration slows considerably.
Speaking of regeneration... Vampires physically do not need to sleep. Their body does not develop exhaustion in the way mortal beings would. As such they do not need to sleep for the kind of regeneration that normal folks need.
However... Their mind does. Sleep is something that we also need for our psyche to process things we have experiences, to process things we learned. So if a vampire does not sleep, they will not do this processing... Which is not only bad for memory, but also for their psyche. This also means that a lot of vampires (due to what I talked about in another blog) do kinda struggle with this. As sleep brings nightmares, but not sleeping lets those nightmares seep into a reality.
Then there is the last thing. Vampires and their fertility. Another thing I spend too much time thinking about. So, what I came to: Most vampires with the cock and balls anatomy will stay fertile, as their fertility does not take up a lot of biological effort. Meanwhile vampires with ovaries loose their fertility some point during the first ten years after being turned. Because, let's face it... I don't want to put an eternity of periods onto anyone lol
As such it is possible for fullblooded vampires to be born - but it is rare.
So yeah. That is in general the rules I use for vampires in my writing.
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