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The sword of Mastus is in one of the tombs you find after defeating scabban in the crypt. After you defeat him you flip the lever on the wall and dive into the water, take a short swim through a tunnel and you'll find four tombs. On the west side of the tombs you will find a submerged hallway with a key at the end, that key will open all of the tombs and you are home free.
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