Necromancer

There are two types of Necromancers, apprentices and masters. Apprentices can summon zombies from corpses (Only humans, no animal zombies in the current versions) and masters can summon zombies and skeletons, including a one-time summon of Xinroch. Necomancers in groups are a problem if there is more than one, since they will teleport, summon the dead, and launch spells like the ones that dark mages launch.

If you encounter a lot of undead and/or the ones that you kill come back to life, it's a tip that there is a necromancer on the level.

Taming

As with most hostiles, necromancers (both apprentice and master) can be tamed. They will retain their spellcasting abilities like tamed wizards and happily set about raising the dead. All zombies raised by a tamed necromancer will automatically be friendly to you.

To Be one...

So, you ask, how can I be a necromancer? To be a necromancer you must use a wand of necromancy to summon zombies from corpses.