Zul'Nec-ro is a powerful Divine One that controls the spirits of the dead up to a certain degree. The spirits of all beings in the land pass through his citadel upon death, at which he can lay claim to some of them. Those he doesn't claim will go on into the Astral Plane. Zul'Nec-ro grows more powerful the more souls are in his care. Zul'Nec-ro himself is tied to the Elemental Plane of Lightning.
To honor the Divine One of death, his followers will don masks in their rituals and pray to him. Zul'Nec-ro in turn will either answer in kind, or curse them with pain, depending on his mood.
As his physical manifestation, Zul'Nec-ro chose to look like a dark-gray-skinned Troll, looking a lot like a Lich. Zul'Nec-ro works with Imbross. Zul'Nec-ro has a citadel down in the Desert of Lost Souls, where he sits on his throne. When needed he meets with the Liches as one of their equals, if not superiors.