The Vrykolakas Avange

Long long ago, before the fearless knights battled the legendary dragons, before evil enchantors mettled in the dark arts, before Rome ruled over with Christianity, before Europe and the world were populated by powerful humans; there existed a darker era.

Christianism although very new, it was gaining power very fast... only two powers ruled the world, the christian church and the Mourge Cult. Of course, like in every society, (no matter the age of existance) rebels are present; they create that needed stalemate between the good and the evil. These rebels are called, The Vrykolakas: ancient vampire creatures that suck the blood out of earths sinners, vrykolakas might feed from evil men, but they arent evil themselves.
These creatures are many, and include different races and species, each one with a distinct gift or power, some even have distinct cultures and rituals: only thing that binds them together as the Vrykolakas, is their purpose to be, to clean the world of sinners.
The mourge cult, is an old version of satanism, where both humans and demons join up to serve the first demon, the source of all badness and evil. These dark priests practice dark magics, along with gory human and Vrykolaka rituals.
One night, (as written in ancient scrolls) an immense battle blew up between both sides, the rebels stood tight and hid. It was said that the sky shot flying stars, and angels crashed from the heavens, while deamons blew up from the ground. There were no survivors from the Mourge cult, affirmed the christian church after a 60 day battle.
A couple of centuries passed, the Vrykos had hidden and mixed in with the normal human crowd. Of course as years passed, people became ignorant of the monsters existance, but they were real and still stalking the earth, in search of those who dont desserve to live in it. The Vryko cult, soon reduced to only a couple of hundreds, not enough to keep going for another millenium. They needed to reproduce, and although they were immortal creatures, they couldnt live longer than 1000 years and theyr pure race couldnt be reproduced by themselves: they were dead humanoids, their blood, and reproductive systems didnt work. So they needed a human carrier, or vessel (a pure hearted human) to be bitten and sired into their species.
The 1700´s became the first Vrykolaka baby boom.