Necromancy

Necromancy is the ability to summon and control things that are dead, or other types of creatures.

Characters with ability

 * Samhain - Samhain, the origin of Halloween, can summon ghosts, monsters, and even demon, to do his will.
 * Osiris - Osiris, the Eygptian god of death, can summon ghosts and cause them to do as he commands, and probably monsters as well.