http://www.youtube.com/watch?v=0zfYtZyQFc4
See King Of Lanka Ravan, prices Siva.
Ravan is an Asura also he have link with Rakshasa.
All these words( Rakshasa, Asura, Naga, Pisacha, Sura, Yaksha), I strongly doubt ancient tribs.
Ravan in Ramayana and Bhagavata wrongly described as a 10...