Asmodeus is a King of demons mostly known from the deuterocanonical Book Of Tobit, in which he is the primary antagonist.
The demon is also mentioned in some Talmudic legends, for instance, in the story of the construction of The Temple Of Solomon. He was supposed by some Renaissance Christians to be the King of The Nine Hells. Asmodeus also is referred to as one of the 7 Princes of Hell. In Binsfeld's classification of demons, each one of these princes represents one of The Seven Deadly Sins. Asmodeus is the demon of lust and is therefore responsible for twisting people's sexual desires.
It is said in Asmodeus or The Devil on 2 sticks that people who fall to Asmodeus's ways will be sentenced to an eternity in the second level of Hell