It's not just about the blood in their system, though.
[ There's a lot more at stake, where novices can't really return. They already experienced, and learned too much, where returning was considered irresponsible. Which is why the talk of how this was all about indulging in sin didn't make sense for her.]
Vampires can only ingest and tolerate the blood of humans. Food provides nothing for them, not even flavor, and animal blood doesn't nourish them either. Humans are the sources of both their offspring and food. There's no alternatives on that. Without a system like this, you run the risk of vampires going feral from hunger, where they can't even feel when they've been satiated anymore, slaughtering entire villages where all they would've needed was a cup full of blood. That you can look up in the library, or wait until later in Xenk's Introduction class.
no subject
[ There's a lot more at stake, where novices can't really return. They already experienced, and learned too much, where returning was considered irresponsible. Which is why the talk of how this was all about indulging in sin didn't make sense for her.]
Vampires can only ingest and tolerate the blood of humans. Food provides nothing for them, not even flavor, and animal blood doesn't nourish them either. Humans are the sources of both their offspring and food. There's no alternatives on that. Without a system like this, you run the risk of vampires going feral from hunger, where they can't even feel when they've been satiated anymore, slaughtering entire villages where all they would've needed was a cup full of blood. That you can look up in the library, or wait until later in Xenk's Introduction class.