Rugaru

Rugarus are creatures that feed on human flesh. They start out human, but will suddenly start craving more. This is not a virus though, it has to be passed down through genes. The person with this gene, will eventually give into the urge to feed and will eat human. The change itself is very fast, and once it happens, the Ruguru will never appear human again.

Although it is believed that a person will this gene can overcome this curse. All they need to do, is avoid eating human flesh, and lot of alternatives. This way they stay human. Unforuntally, no Rugarus have been sucessful in this.

Metamorphosis
The first time Sam and Dean hear about Rugarus is from a hunter named Travis. He sends them to watch Jack Montgomery, a man who is about to become a Rugaru. Jack is showing signs of his incoming change, but resists. Later Sam and Dean tell him about whats happening, and Jack kicks them off his property. Because of Travis's intervention, Jack takes the first bite and becomes a Rugaru.

Abilites
Superhuman Strength- Rugarus are stronger than the average man, and can easily break bones.

Speed- Rugaru are essentially like animals. Speed is nesisary in order to catch its prey

Flesh Eating- Its prime motivation, and food.

Weakness
Fire- Rugarus can only be killed by fire. So hunters need to burn them alive.

Appearances

 * Metamorphosis