Eternal Prisoner, but, dead now.
Centuries ago Karavakos was the ruler of a small kingdom. A rebellion threatened to take his kingdom from him and so in desperation he made a bargain with a devil. The devil granted him a legion of infernal soldiers, in exchange should Karavakos ever lead the army to defeat he would be imprisoned for eternity.
His army proved to be unbeatable and he conquered a vast amount of territory. But when Karavakos made the decision to take his campaign to the Feywild he discovered his army did not possess the powers they had in the natural world. His army was routed and he was imprisoned in the Pyramid of Shadows.