minor spoiler! -
Try to get your disposition with the mage up (to 60 or 70 not sure) and talk to him, after you got the scroll from him again, about the reverse invisibility scroll.
He will start about the spell having some effects and that he always uses some ring he makes himself. He will give you a ring which you should put on when you use the scroll.
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<img border=\"0\" alt=\"[worship]\" title=\"\" src=\"graemlins/worship.gif\" /> TES IV : Oblivion<br /> <img border=\"0\" alt=\"[worship]\" title=\"\" src=\"graemlins/worship.gif\" /> Vanguard : Saga of Heroes
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