All it takes is a good bow and a good arrow and a good shot, keep disrupting the mages spells
(I know this wouldn't always work but it usually does) and I do not belive for a second that a level 19 fighter would be able to beat a level 50 mage! (I'm not saying it's not possible just HIGHLY!!!! unlikly)
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Master Assassin of the Holy Flame.
My website
http://hesperex.8k.com