Baba Yaga

On dark nights, the Little Grandmother, the Iron Toothed Hag would fly across the skies of Russia on her magic mortar, and under her shadow milk spoiled and babies were born dead, or so they said.
For millennia, the creature Baba Yaga slept under the soil of Russia, perhaps from the time of Kiev to the time of Stalin. Baba Yaga is a Methuselah, a 4th Generation Vampire, although not an Antediluvian it is said that the Nosferatu are split in two, The Nicktuku, faithful to the Antediluvian Absimiliard who In retribution for, is said to hunt down all of his own childer (the entire Nosferatu clan).  and the Nosferatu who where a branch that started with Baba Yaga.  and are being hunted by the Nicktuku.
So the Shadow Curtain is created, it is still unknown how Baba Yaga created the Shadow Curtain but it prevented for any kindred who tried to cross it. Baba Yaga might have ruled Russia in perpetuity, but for the legend of Vasalisa, the little girl who completed three impossible tasks for the Little Grandmother. In this case, though, Vasalisa was a Nictuku who was sent to slay Baba Yaga achieving it in the year 2000 when the Shadow Curtain fell.