Nhagruul

Nhagruul was an Evil Mage and disciple of Vecna.

History
A sorcerer of some renown, Nhagruul and his sect of Vecna worshipers controlled the Temple known as Margoth in the mid 9th century. Having received the Book of Vile Darkness from their master, the priests were motivated to indulge in darker and darker acts, including creating hideously mutated and corrupted creatures, including Nhagruul Dragonspawn. From exposure to so many of these fell magical experiments, Nhagruul became hideously disfigured until he was barely recognizable as human.

In 853, Margoth, who was becoming increasingly twisted and depraved due to the influence of the Book of Vile Darkness, captured Althaea, a young, Half-Elf Wizard from Haelrion. After subjecting the young wizard to many agonizing magical procedures as part of their inhuman experiments, the priests, following the instructions of the Book of Vile Darkness, summoned an odd swarm of worms from the Far Realm and set the worms upon Althaea. The worms devoured her flesh, transforming her into a Star Spawn Larva Mage. After observing the success of their experiment, the priests left Althaea to rot in one of their prison cells.

Eventually, the Book of Vile Darkness had so warped the minds of the priests of Vecna that they all turned on one another, slaughtering their fellow adherents until only Nhagruul remained. As he grew nearer to the end of his life, Nhagruul transformed himself into a vampire in order to continue his evil work indefinitely. Lurking in the overgrown ruins of Margoth, Nhagruul sunk deeper and deeper into madness, his fanatical devotion to the Book of Vile Darkness only growing.