To get easy will points in Fable, acquire the 'summon' spell. Then, use it over and over, just hold 'R' and hit the button that the spell is assigned to. Do this repeatedly until your will power runs out. This takes a while to get a lot of points, but it is worth it.
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ok you could get athe sword of aeons and gain like 5 combat multiplayer per hit and then get tons of EXP