In Romanian mythology, strigoi (English: poltergeist) are the troubled souls of the dead rising from the grave. Some strigoi can be living people with certain magical properties. Some of the properties of the strigoi include: the ability to transform into an animal, invisibility, and the propensity to drain the vitality of victims via blood loss. Strigoi are also known as immortal vampires.
Read more about Strigoi: Etymology, Different Types of Strigoi, Becoming A Strigoi, Prevention, In Popular Culture