[Morgeruat]

Check the ToB manual for specific effects of wild surges, butthe wild mage is a specialist mage with no opposition school, he can use every spell in the game and gets an extra spell per level, in addition anytime they cast a spell the computer "rolls" a d20 to determine if your effective spellcasting level changes, (ie as a 7th level mage you could get a +3bonus to your level, so you would launch 5 magic missiles instead of 4, or have your fireball do 10d6 instead of 7d6)

overall it's an awesome kit, and making it rain cows is one of the funnies things i've ever seen in the game.