"What is the best description of a Mullo (Gypsy Vampire)..."?

Question

..."That you can give outside of any fictional work? Please specify strengths, weaknesses, etc."

Answer 1

From Wikipedia:  "Mullo (Muli: female, Mulo: male) is an undead, revenant, or vampire of gypsy (Roma) folklore. 'Mullo' means 'one who is dead'. A dead person would return and do bad things and/or feed on the blood of a living person. The victim was usually a relative who had caused the mullo's death, or who didn't correctly observe the burial ceremonies, or who kept the corpse's possessions instead of destroying them as was proper. A European mulo shares similarities with the Japanese onryo."

They didn't have specific strengths or weaknesses. They came back for revenge.