Wamphyri

The Wamphyri are an extraterrestrial vampiric race that comes from the dimension known as "Starside/Sunside". They are leech-like parasites that bonds with hosts and grants them a infinite lifespan and supernatural abilities such as: telepathy, ESP, shapeshifting, superhuman strength and speed, and the need to sustain it all by consuming blood.

Biology
The Wamphyri leeches in their true forms resemble worm-like creatures with snake-like bodies and shovel-like heads, and fanged mouths.

Once the leeches bond with human hosts, their human hosts will posses pale skin, red eyes, pointed ears, fanged teeth and clawed hands and feet.

If the leeches bond with canine animals (such as wolves or foxes), they create Werewolves (vampiric wolves able take human-like forms to lure preys towards them).

Some Wamphyri Lords look like Count Orlok from the silent movie "Nosferatu: A Symphony of Horror".

Some humanoid Wamphyri posses beastial traits such as: canine muzzle and chiropteran ears. This may be due to their distant ancestry from an infected animal.

The Wamphyri Werewolves (humans infected by vampric wolves) are capable to shift into wolf-like creatures.

Some Wamphyri are able to transform into bat-like forms for flight.

Shaitan The Unborn (who is the progenitor of all vampires), mostly resemble a giant anthropomorphic version of his leech.

Some Wamphyri loses control of their metamorphosis, causing them to mutate into massive amorphous blobs of mouths, eyes and tentacles.

Appearances

 * Brian Lumley's Necroscope series