Queen Belladonna was thought to be the one to wed the then Prince of Thandac but the man fell in love with her sister so Belladonna plotted their demise and her taking over all of Thandac.  She persuaded Bastion Blud to join in her aspirations to greatness and with the Dark Wizard and Bastion they turned many minds of The Royal Black Dragonguards to turn on their own and fight to the death.  She is vain and greedy and is obsessed with the thought that the Princess had escaped even when she had ordered her head on a silver platter.  It was of course the head of some innocent girl with the same hair and eyes.  She had the Dark Wizard make her a Mord Syth and she is the leader of them in name only for she will not take a chance on getting blood on her hands. Or worse seeing her own blood shed in any way, shape or form.