The Mage Hunter is already a class but I can't find the book on my shelf. I'll have to look harder. There might be some useful information to add to your class or it may cover some pitfalls you haven't thought of yet.
By evil creatures, you are referring to sentient monsters like giantkin and goblinkin right? They have a loose system of government, or enough intelligence to band together to attack the other continents?
Are you going for a pantheon of deities or does all clerical/paladin magic come from Aloth?
So far I think its intriguing. Do the gnomes possess a technological superiority or are they just magical? How magical are your elves and do sorcerers still boast dragon blood?