Impundulu

The Impundulu is a strange creature from the myths of South Africa. There are known to be several different variations of the Impundulu. They are often thought to be familiars belonging to witches that are then passed down through the generations. However while they commonly serve witches, it is unclear if they do so willingly, or are forced to do so with magic binding. They most commonly target the enemies of those in charge of them. They survive by draining the blood from livestock. If the Imundulus boss is angry enough at someone then the Impundulu may kill them and their entire families and their livestock completely unprompted. Sometimes they have been known to seduce those in charge of them. They constantly hunger for blood, and if not kept in check could kill entire villages in horrible mass murders. They often take the form of attractive men and use this form to seduce women, luring them in and killing them after revealing their true selves. They often spread diseases like a wasting sickness, an illness that prevents livestock from breeding, or an illness that causes a sharp pain in the head or chest and then immediate death. They can overcome whatever magic binds it if they consume too much blood. They can bring humans to madness by making them desire to cut themselves or put them in a sexual frenzy. They are immortal unless killed by fire. If they are improperly passed on either by incorrect spells or the next generation not being strong enough to control it, then it will get free and is called an Ishologu.

Citations:

Maberry, Jonathan. Vampire Universe: The Dark World of Supernatural Beings That Haunt Us, Hunt Us, and Hunger for Us. United States, Kensington Publishing Corporation, 2006.