Lamia

Lamias are supernatural creatures that the Winchesters have come across. Little information has been given about them - as they are monsters rearely seen out of Greece.

A lamia appeared briefly in 'Weekend At Bobby's', as one of Dean and Sam Winchester's cases.

Characteristics
As most of the other creatures that appear in the series, they can look like normal humans. However, it is implied that they can transform into a non-human form, which apparently has large claws (as the brothers examinated a dead body at a playground with its chest cracked open, and found a claw). One of their features is that they squeeze their victims' hearts and suck the blood.

Known Abilities
It is also implied that Lamias have enhanced strenght.

Weaknesses
Information about them says that there are two methods to kill a Lamia - one of them being the use of a silver knife blessed by a curate, while the other is ...

Mythology
In ancient Greek mythology, Lamia (Greek: Λάμια) was a beautiful queen of Libya who became a child-eating daemon. According to Diodorus Siculus, Lamia had an affair with Zeus and bore him children. When Hera, Zeus' wife, discovered the affair, she became enraged and killed the children. Driven insane with grief, Lamia began devouring other children, and, as related by Diodorus, her face became hideously distorted from her grisly deeds.

Later traditions referred to many lamiae; these were folkloric monsters similar to vampires and succubi that seduced young men and then fed on their blood.