The ovinnik was one of the many “house spirits” common in Russian folklore. Unlike most, it did not appear as a snake or humanoid, instead taking the form of a black cat. The above stats are for a very large example of the creature. In some tales, they were no larger than ordinary cats. The ovinnik was only encountered in farmyards, and (like most other spirits) was exclusively solitary.
The ovinnik’s general role was to protect the farmer’s grain stores, crops and livestock, while living in the barn and expecting gifts of food. In some stories, however spiteful ovinniks became raiders, stealing food from peasants and becoming nuisances at best, serious threats at worst. Their reputed powers included invisibility and fire magic as well as the ability to charm their enemies before attacking. Any or all of these might be true.