Necromancy is forbidden form of Magic. It is known to be used by Seigrim.
Necromancy is often feared art, as it can be used to make army of countless dead easily. Its most dreaded technique is make user undead while he is still alive, thus creating Lich : Powerful undead mage.
Army of the Dead : By hitting his staff to ground, user makes nearby corpses resurrect. Even bones are enough to create Undeads.
Death Bless : After special rite, Seigrim was able to undead while maintaining his inteligence and magic.