The Eretik can be killed by an Aspen stake.
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The Eretik is form Russian lore and is a cannibalistic vampire. The term eretnik took the place of the word upir, which was a very old Russian term for vampire. It is described as a dead person that comes out of the grave to prey on living individuals. It was believed that sorcerers or non-christians would come back as an eretik. When this particular body is dug up it is most often lying on its stomach. The vampire can be stopped by burning the body into ashes or stabbing an aspen stake through its back.

The Eretica, from Russian lore.
©BloodyLexicon.com

The Eretica is from Russian lore and is closely related to the Eretik. They are described as appearing in the day time as an old ugly poor woman that possesses an evil eye. They are said to only appear during the spring and fall time. At night, they sleep in coffins or enter the village’s bathhouse by going down the chimney. They splash around in the water hoping to get the devil’s attention. Women become Ereticy when they sell their souls to the devil, when they die they become a vampire. They roam around as vampires shunning people away from Christianity. It is thought that one day a Eretica will give birth to the Antichrist. If one views the Eretica, death will soon follow. You can also die by looking an Eretica in their evil eye.