" We’re called guardians. I’ve spent my entire life training to protect Moroi from Strigoi. I have a whole set of special classes and practices I take at St. Vladimir’s Academy, a private school for Moroi and dhampirs. I know how to use all sorts of weapons and can land some pretty mean kicks. I’ve beaten up guys twice my size—both in and out of class. And really, guys are pretty much the only ones I beat up, since there are very few girls in any of my classes. Because while dhampirs inherit all sorts of great traits, there’s one thing we didn’t get. Dhampirs can’t have children with other dhampirs. Don’t ask me why. It’s not like I’m a geneticist or anything. Humans and Moroi getting together will always make more dhampirs; that’s where we came from in the first place. But that doesn’t happen so much anymore; Moroi tend to "

― Richelle Mead , Frostbite (Vampire Academy, #2)