Strigoi.
Living dead monstrosities haunting the villages and byways of Romania and Eastern Europe for over two millennia, shunning the sun and preying upon the blood of the living. They are a thing of nightmare, born of ancient dark arts and created to instill fear in the hearts of the invaders of their ancestral lands.
What you see is only a hateful remnant of what once incited such terror in the heart of Rome that Emperor Aurelian withdrew his legions from the frontier for fear of them. They hunt in the shadows of your world now, but once they roamed these lands like vengeful gods.
You see, the strigoi are an invasive species and have no natural predators. They are the locust in the wheat field of humanity.
I know this, for I am Adaric, Culling Master of the House of Boars.
And I am strigoi.