The World Dictionary

dark magic:

1.  any magic that is usually viewed in a negative light

2. any magic associated with darkness (neutral connotation)

some kinds of dark magic with definition 2 can be seen as gentle and beneficial

necromancy:

magic dealing with summoning or controlling ghosts/skeletons/zombies/other undead

light/dark illusion magic:

magic used best by light/dark (BOTH) mages, creates illusions

all the different elemental mancies:

pyromancy: fire

aquamancy: water

terramancy: earth

aeromancy: wind

cryomancy: ice

electromancy: lightning

lumimancy: light

umbramancy: dark

biomancy: life

thanatomancy: death