Necromancers in Diablo are members of a sect named the Priests of Rathma.
One thing I've never really thought about until just now is how games like Diablo 3 code their monster's corpses.
A new Diablo comic has been released, focusing on the newly arrived Necromancer and their training within the mysterious Priests of Rathma.
The barbarians of Sanctuary are called this by those who do not understand them or their ancient culture, which was a casualty of the schemes of Baal and the actions of Tyrael. In destroying the Worldstone, they destroyed Mount Arreat and with it the very vigil that the barbarians maintained for countless eons.