Storm King's Thunder
Lord of Lance Rock
Oreioth is a mad necromancer from Baldur's Gate. He was always fascinated by death, ever since his pet mouse died when he was a boy. His obsession grew to be an embarrassment to his well to do family, who sent him off to apprentice with a wizard who just happened to be a necromancer. Oreioth was eventually sent off, and he found his way to Lance Rock, where an artifact of the Elemental Eye drove him further to the edge of madness. His isolation was broken when the Knights of Lance Rock dropped in on his lair and forced him to adopt a strict moral code regarding the use of dead bodies. They formed an alliance that gave the Lord of Lance Rock an almost endless supply of corpses (the bandits and cultists killed by the adventurers), and in exchange the Lord of Lance Rock protected the artifact from falling into the wrong hands.
Prolonged exposure to the evil eminating from the Elemental Eye threatens to plunge him fully into madness, and the Knights of Lance Rock are attempting to find some kind of cure or protection from its effects.