at what level did you do it? because at level 25 it was very hard for me. i had to use many potions ans scrolls...i had all the defense, except mage barrier at level 2 only...you can not get all the spells... i was used to have it maxed, but when i had to face the lord carrion i decided to max desintegrate instead...i had to erase all my advanced skills, this costed my more than 50k...
this game is very hard for mages...when facing magic resistant monsters...