Lauka Vai, the Mother of Nightmares
Lauka Vai, the Mother of Nightmares, is the leader of the Avengorii dynasty of Soulblight vampires. Her main schtick is that she, like all other Avengorii vampires, is a bloodthirsty monster desperately trying to conceal her bloodlust behind a thinly veiled pretense of honor and nobility. In her case, this is made somewhat difficult, on account of her lower half being some sort of horrifying bat/demon/dragon thing. Not much else is known about her at this point, but she does have her very own book on the way, in which a free city makes a deal with her to stave off a Chaos invasion. Where have I seen this before?