Welcome to the forum, Inbreed!
Sword of Mastus can be found in the lower crypt - area with several tombs (Tomb of Mastus, Tomb of Nivius, etc.). The sword is in the Tomb of Mastus.
MINOR SPOILER
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I believe everyone knows this, but - just to be sure - you can get to lower crypt pushing the lever on the wall in the room with Scabban and jumping into the well in the same room. A little swimming through underwater tunnel - and you'll find yourself in the tomb area
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Good luck!
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Tanda,
with best regards from Guild of Assassins
[This message has been edited by Tananda (edited 07-22-2001).]