I am currently trying to come up with a thirdschool of black magic for my next sugestion game.
by now i have:
There are 5 types of magic, White,Green, Blue, Red and Black
White Magic (W)
White Magic deals primarily with Virtue, Purity and Light. It is the chosen magic type of Angels and Knights.
Virtue: Offensive and Defensive enhancements.
Purity: Destruction of unnatural Enchantments and artifice. Banishing of Evil.
Light: Especially potent against Black magic creatures. Mostly offensive
Green Magic: (G)
Green Magic is used to strengthen the body, summon creatures and commanding nature. Elves are natural users of green magic.
Nature: From growing Brambles to stop your enemies to animating a whole forest.
Summoning: simple squirrels to mighty Elementals. Not just limited to creatures.
Body: Healing and Toughening of your own body.
Blue Magic: (U)
Blue magic is of the Mind, Artifice and Water.People living near the sea and merfolk practice blue magic.
Mind: from simple manipulations of minds to putting it over matter.
Artifice: creating items of use and mechanical constructs
Water: Ice to steam – you can control it – you can create it.
Red Magic: (R)
Red magic is the magic of Heat, Destruction and Battle. Mountaindwellers and especially Dwarves use this magic.
Heat: Inner heat outer frost. Deals with Temperature.
Destruction: most offensive magic. Think Demolitionist.
Battle: Offensive enhancements of combat proficiency often at the cost of defense.
Black magic: (B)
Curse: Mostly deals with weakening enemies or enchanting items to get stuck on people that touch them.
Shadow: Manipulation and utilization of the ever present darkness.
Mind you, there are schools of magic that are hidden at the beginning. Necromancy is not available.