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Necromancy, also known as rehket or seer, is a powerful form of magic. It is used to call upon the power of the dead. Necromancers can summon skeletons, ghosts and mummies; all of which are undead. The spirits that they summon can attack people, defend people, answer questions, or even haunt in dreams. These creatures can also heal by sacrificing themselves.
If powerful enough, the user can make the corpse tell the future. Necromancy is one of the many paths an initiate can follow. It is opposite to Death Magic, due to the fact that Necromancy raises beings from the dead, while Death Magic causes death and decay.
The House of Hades
In the House of Hades, Nico Di Angelo summons dead roman soldiers to help fight Gaea's minions. They can only be summoned by a ranking Roman officer.