Sanctuary Fighting back the darkness with style.

Rakshasa: (fem: Rakshasi) From Hindu Mythology, these creatures are considered demons. They are portrayed in different ways - some stories have them acting as enemies of the Gods, similar to the Titans of Greek myth. Others show them as, "... demons and fiends who haunt cemeteries, disturb sacrifices, harass devout men, animate dead bodies, devour human beings, and vex and afflict mankind in all sorts of ways."
The chief of the later sort of rakshasa is Ravana.
The Ramayana discribes them this way:
"the Rakshasas sleeping in the houses were of every shape and form. Some of them disgusted the eye, while some were beautiful to look upon. Some had long arms and frightful shapes; some were very fat and some were very lean; some were mere dwarfs and some were prodigiously tall. Some had only one eye and others only one ear. Some had monstrous bellies, hanging breasts, long projecting teeth, and crooked thighs; whilst others were exceedingly beautiful to behold and clothed in great splendour. Some had two legs, some three legs, and some four legs. Some had the heads of serpents, some the heads of donkeys, some the heads of horses, and some the heads of elephants."
(f) According to Sam and Dean Winchester, the only way to kill one is with a blade of pure brass.