These are methods of extending the power and practice of a dedicated practitioner. They involve reaching out to the three primary realms of existence. They also tap into different power sources, call upon different allies, and are able to create different effects.
Celestial necromancy involve the following aspects: the blessed dead, celestial deities and powers, the celestial current, soul magic/mysticism,
Chthonic necromancy involves different aspects such as: the deities and powers of various underworlds and hells, the tellurgic current, erebeal magic, the unhallowed dead, etc.
Earthly necromancy involves yet again different aspects including: the earthly current, the deities and powers of nature and elements, the restless dead, druidic magic, the other middle realms, etc.
Other forms of necromancy include: planetary, ancestral, literary, etc.