Zorrath was one of the main chains that held Gilded Skulls together, he was the one performing all the important rights and the right hand advisor to Moranak, but the power that emberstone possesed corrupted him and he wanted power that was not his nor was it granted by Khorn, Zorrath not only used the power in emberstone he even tried and bound deamon inside of himself. This all so that he would betray Moranak and take his place as the new leader of Gilded Skulls. The result was not what he was hoping for. Now he is nothing more than a beast and unfortunately for him Moranak knew how to bound a beast to his will. Now Moranak has a new loyal dog.
In battle Zorrath is now only concered with the gore and blood. His madness even spread into some of the warriors and turned them into wrathmongers.