The Shaman has the ability to control corpses and spirits similar to the Necromancers, but how much level depends on the ability of each person to research. Even so, their level of skill was still far below those of Lich-level Necromancers.
The ancestor of the Necromancer race was an outcast race from the era before the establishment of the Nine Realms. Their original name at that time was completely forgotten. In the persistent battle between the clans on the threshold of the establishment of the Nine Realms, this ethnic group played a double game before being discovered and labeled as a Traitor. When the Nine Realms were founded, they were abandoned by the other worlds and forced to find shelter in Nilfheim, then build a new civilization in the Helheim forest there.