Brucolac

A kind of vampire found in Multan (Moldavia), Transylvania (Semigradje) and Dobrudja, especially often in Wallachia (Southern Romania). 

In appearance, the brucolac seems incredibly swollen, and its skin is stiff and stretched like a drum, and it sounds the same when struck.

Every night he lets out a piercing scream once and whoever responds to this call becomes a victim. To kill a brucolac, you have to chop off his head and immediately burn it in the fire.

Sapkovsky points out that "brucolaks are found not only on Romanian lands, but also in Bulgaria, Greece, and also in Russia, where they are called burdalaks or ghouls."