In Arcanum, magick spells are divided into 16 colleges with five spells in each. Learning one spell will increase your magickal aptitude by five.
Using spells will drain from your Fatigue pool.
The colleges are:
Black Necromantic
Conveyance
Divination
Earth
Fire
Force
Mental
Meta
Morphing
Nature
Phantasm
Summoning
Temporal
White Necromantic