First you will need the following items and spells: summonL3, berserkL3(optional), physical shieldL3 and a heavy weapon like the bereaver or the solus greatsword. first, go to archon's shrine, cast physical shield and then berserk(again, optional)you might want to use a will potion after berserk. kill all of the balverines if there are any, then kill the wraiths. you CM should be at about 30-35. cast summon rapidly and drink will potions when needed. do this repeatedly and you will have a bunch of will exp. at your disposal.
happy slashing!