This is a glitch I found handy-get Multi-Strike, then keep on using it and hitting the Guildmaster. You're combat multiplier will go up-I got mine over 300-and for each time you use multi-strike, it will be 10X the multiplier. I got all the spells maxxed out before I reached Orchard Farm!!!
There is another glitch like this except its at the end of the game, when you kill your sister. Just hit her with a normal sword and your multiplier will go up.
You can have my Xbox, when you pry it from my cold, dead fingers.