It's a bug, probably happenend after you installed ToB. 2 ways to fix
1. De-install the game totally (shouldn't delete your save games)
2. Get the ToB patch
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http://www.angelfire.com/rpg2/mirac
I'd be Mirac, mighty mage of er... uhm.. er.. - Mirac Honorguard
Fellow Table Dancer of the Jerome's Table dancer group
Spell formulater of the IW peace-keeping force