Archaeology at Saarthal...

TES-V: Skyrim, Hearthfires DLC:
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Archaeology at Saarthal,
by: M7-2018.
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Recent excavations at Saarthal have discovered Dwarven Ruins leading into the bedrock above the site.  Go there and help excavate it.  You will need a Pickaxe (to excavate boulders), Archaeology Basket & Sifting Ore (Spell Tome, Apprentice Level) to sort the artifacts until you make a complete Dwarven Sword, then make the Key to the Lost City of the Dwarves.  Fight your way there.  Your reward is in the City itself. 

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M7 2018.