Source: Howl of the Carrion King, pg(s). 59
A powerful creature known as a Behir Lazzairhage would be a fearsome opponent by himself but he is also the leader of a small tribe of gnolls called the Wyrmslaves. While Lazzairhage believes himself to be completely in charge of his cowed servants he is in fact quite a stupid creature and is being easily manipulated by the more cunning gnolls. They have already 'persuaded' him to ally with the powerful gnoll leader known as the Carrion King.