Lauka Vai, the Mother of Nightmares

I don't know what the fuck that thing is, but I want it.

"I hate what I’ve become! The nightmare’s just begun! I must confess that I feel like a monster!"

– ”Monster” by Skillet

Lauka Vai, the Mother of Nightmares, is the leader of the Avengorii dynasty of Soulblight vampires. Her main schtick is that she is a bloodthirsty monster desperately trying to conceal her bloodlust behind a thinly veiled pretense of honor and nobility.

History

Lauka was originally the leader of the Askurga Renkai, an order of Blood Knights who refused to prey on those weaker than themselves. However, in a battle against a Tzeentch sorcerer, she was mutated by them into a horrific monstrosity, becoming the first of the Vengorian Lords. Believing her to be corrupt, the Askurga Renkai turned on her, forcing her to kill them in self-defence.

Disgusted by what she became, Lauka Vai exiled herself into the wilderness of Ghur, where she fought monstrous beasts and warlords by herself. If civilians saw her she usually fled, but sometimes she could not control her bloodlust and committed atrocities that would haunt her when she returned to lucidity. Eventually she'd be discovered by the Avengorii dynasty, a bloodline of vampires that willingly embraced their own monstrosity and viewed mutating into a Vengorian or Vargheist as an honor. Given their shared forms, the Avengorii revered her as a paragon of their kind, and although their savagery offended her code of honor she agreed to become their leader, as this was the first companionship she could find in a long time.

Even as the leader of a bloodline of abominations Lauka Vai still attempts to keep to her code of honor, refusing to prey upon the defenseless and focusing instead on fighting the forces of Chaos and Destruction. She even fought against the forces of the Ivory Host Bonereapers for a time, believing their bone-tithing of civilians instead of exclusively hunting monsters and worthy foes was a cowardly disgrace to the forces of Death. Lauka nearly won the resulting war until Vokmortion negotiated a compromise between the two parties. Yet every time she falls into her bloodlust, it becomes more difficult to return to sanity. If she ever reaches a point where her mind breaks entirely, a grim fate will be released on the denizens of Ghur...

Incidentally, her dynasty really likes big scary monsters (and really, who can blame them), to the point of being able to take Terrorgheists and Zombie Dragons as battleline! 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?