Necromancy

Necromancy (黄泉巫術, Yomifujutsu, lit. Underworld Sorcery) is a form of Black Arts, that is utilized by the enigmatic being known as Erebus Nightwalker. This Lost Magic, allows its practitioner to conjure vile spirits, commune with and command the dead, even raise them into various powerful undead monsters. According to Erebus, this form of magic is considered Divine Magic, in that he draws his power through faith in the goddess of death ---Nyx.

Description
Necromancy is a broad category of magic, that allows the practitioner to utilize various black arts to manipulate the souls of the living and the dead. It is an incredibly complex art, and can be first identified by its use of Holder Magic; necromancy makes heavy use of magic circles, sigils, and various symbols in order to draw the necessary connection to power any given spell. Erebus being a "Holy Knight" of his Goddess, uses his holy symbols to draw a connection to his goddess using his faith as the bridge. Through this, he is able to draw upon terrible powers of life and death. Necromancy is similar to Death Magic, though according to Erebus, necromancy draws its power from negative energy a source of power existing in an "outer realm" beyond the fringes of the universe, that seeps into our world. He calls it the source of all evil magic. Using necromancy, Erebus is capable of summoning forth this power into various forms such as waves or clouds of this thick black miasma. However it also shows elements of Living Magic, in its ability to drag spirits and implant them into corpses to create powerful undead, intelligent; sentient undead.

More to come...

Goddess of Death
Nyx, as Erebus refers to her is the Goddess of Death, and he is her Paladin, a champion of her cause. Beyond that, there is very little information regarding her origins, and what her true aims appear to be. She apparently acts as the master of Erebus, directing him and granting him blessing, including much of his unique powers.

Trivia
Necromancy is heavily based on the magic of the same name in Dungeons and Dragons, as well as Pathfinder. Illuminate Void Magic and Abilities Caster Magic Black Magic