The Sibiliant Beast has elected a champion, in the form of Mherren Halfblood, to recover a an esoteric book that contains lost rites to summon him to the mortal plane. He refuses to share in any power that Orcus or any other demonic overlord might attain, and so also competes to find the Sword of Air and wield its power himself, spreading madness and ruin to the living souls that will not bow to his dominion.

The Sibiliant Beast has elected a champion, in the form of Mherren Halfblood, to recover a an esoteric book that contains lost rites to summon him to the mortal plane.
 
He refuses to share in any power that Orcus or any other demonic overlord might attain, and so also competes to find the Sword of Air and wield its power himself, spreading madness and ruin to the living souls that will not bow to his dominion.