The Elder Scrolls IV: Oblivion/Spells

Alteration
The college of alteration focuses on the manipulation of the physical world.

Destruction
Destruction magic focuses on damaging the health and attributes of you or your opponents

Mysticism
The college of mysticism focuses on manipulation of magical energies

Conjuration
Conjuration is the college of magic that allows you to summon otherwordly creatures, weapons, and armor.