There is ONE other way to get ring of wizardry (no pickpocket) without killing one of your apprentices (good chance). If you do the harper quest with jaheira she will be summoned to the harper hold and then a day later will return to your party. She will ask you go to the harper hold where you will have a showdown with galvery. The ring will be one his body. This ring rocks. The ring of fire resistance is one the rakasha in the fisrt level of the dragon ruins in windspear hills. The staff of the magi is on the woman mage in the twisted rune quest (bridge district in back of lich's house with rouge stone)
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ShadowMaster of the Theives of Darkness.
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