He probably meant that he imported his Fighter and made him a Kensai (btw, same thing I did).
One of the perks is you can make a human fighter with all 18th in physicals and Int and very low wisdom and charisma. At the end of the game that fighter will have 19 Str, Dex, Con, Int, reasonable Wis (from 3 books) and some charisma (4?) Then you can dualclass him into a mage (I plan to do this on level 13). Now you have an awesome fighter who can cast Ghost armor on himself, plus mirror image, blur, improved inivisibility, stoneskin, haste, fireshield, Tenser's transformation, what more can you ask for?
19 int means NO LIMIT of spells in the book/level