I noticed in the character creation screen you changed knowledge to willpower. Willpower is typically known as the resistance type stat and the stat of most use to the psion(perhaps to get ready to add that class in in an expansion pack?).
I'm guessing willpower will determine mana points and resistances. Wisdom will determine the strengthen of clerical spells and intelligence the strength of mage spells.
Instead for fighters, it should determine their ability to fight through the pain and determine their ability to use adrenaline rushes in battles. For mages it should enable them to do things that no ordinary mortal to do. Ocassionally, based on willpower and how heated and desperate the battle is, spells have the potential to do much more damage.
So a player with more int and less willpower would do really well against sewer rats but not so well against the sewer rat king and a player with more willpower and less int would do well against the sewer rat king but not so well against regular sewer rats.
