Hailing from the myths and folklore of the East Slavic peoples, the Upir is a classic vampire of the older kind. It is not romantic, or sexy, or scheming. It is a rotting corpse risen from the grave to feed on the living while trying to go about the business of the life it has lost. Perhaps it died of disease, or was cursed, or was buried improperly, or any number of other reasons. Maybe it was slain by the bite of another Upir. 

As much zombie or ghoul to modern sensibilities as vampire, it nonetheless drinks blood and does not eat flesh, though it will rend an enemy limb from limb with its sheer super human strength if threatened.

The Upir can also let loose a bloodcurdling scream that stuns those that hear it, and sometimes kills. In the stories, they would climb bell tower to do this.

An upir feels no pain, no fear, no remorse. Even overwhelming damage will not slay one, unless they are burned, or staked and decaptiated, preferably all of the above. The stake might be iron or wood, but must pin the creature to the ground. They recoil from holy symbols, garlic, wild roses, and hawthorne, and can be distracted by scattered seeds or knots, which they have a hard time not stopping to count or untie.

While they are infectious, turning others into more like themselves, as well as simply exposing them to the diseases carried by a dead body, they have no control over any such creature they spawn.

In addition to being an obvious rotting corpse, they generally are active in their own original communities, and are known to be dead. They must rest in their own grave daily, which does leave them vulnerable to hunters...but they have no particular difficulty with sunlight.

(disclaimer: this is merely my take on the Upir based on research, and many individual stories protray them quite differently. Some cannot abide the sun, some carried their own detached severed heads, some flee the crow of a rooster. The list goes on, modify at will.:)

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