I wanted to remind everyone that all of the spells in KT are customized. It's possible to obtain a true level 60 in spell power by not multi-classing. Taking even one level in another class reduces spell strength for the levels past 60, because those levels are divided evenly between the number of classes. For example, a dual class fighter/mage can only get 10 extra levels of spell power at level 60, and a triple classed character will only get 6 levels at 60. A true level 60 wizard will cast a 60 hit die fireball.