Nerull

Nerull is the deceased evil god of death and undeath. He created the shadowfell and ruled it until the later days of the Age of Attrition. Using Vecna to command his undead army in the natural world, Nerull planned to kill all beings so he could have domain over all. A mysterious goddess, calling herself The Raven Queen appeared and was able to kill Nerull, but not before he was able to raise Vecna to a demigod.