The Creatures of Supernatural

Djinn isn't like the geni of Alladin, it's a more evil darker version of it as shown on the series. He grants wishes, but it doesn't have to be a verbal wish, it can be mind read or just a dream come, with a price. The Djinn captures Dean and touches him, giving the one thing Dean always wondered, what life would have been like if his mother was never killed? Dean experiences his life but the Djinn is feeding off his blood while Dean is unconscious.

Doctor Benton is shown to have a obsession on finding the ability to become immortal. He uses peoples living organs to create or renew parts of his body to create the ultimate immortal body.

Rugaru

Episode: Metamorphosis

A Rugaru Starts as an ordinary person but around the age of 30 they develop an insatiable hunger. when they take their first tast of "longpig" or human they turn. Rugarus often travel through the family line.

A shape shifter is someone with the ability to change their shape and appearance to that of someone or something else. They can also channel thoughts and memories to act as if they were the real person, but they have to keep the person they are impersonating alive, in order to maintain there form of shape and channel the thoughts or memories.

A tulpa is a Tibetan thought form. This one came about because of the website Hellhounds lair. The Tulpa is a thought that if believed by enough people can become into a real living, breathing thing. Sam and Dean had to change the story and give it a weakness so they could kill it.

A Paegan God, that is described in the series to have two sacrifices each year, one female and one male, to keep the near by towns trees and flowers in season/bloom.

The Carrigans are winter paegan gods. Like the scarecrow they take sacrifices but they like to have more then there fair share. Like every other paegan god they have a ritual they have to perform before they eat.