Diagram: The Digger

A copy of this diagram can be purchased from the following merchants:
 * Yanne, the blacksmith at Kaer Trolde keep
 * the Blacksmith in Arinbjorn
 * the Blacksmith in Fayrlund
 * the Smith in Fyresdal
 * the Merchant at the Isolated Hut on Hindarsfjall
 * the Blacksmith in Svorlag

Other copies can be found in the following locations:
 * chest in the elven ruins beneath Oxenfurt, during the quest "The Great Escape"
 * chest in Arnskrone Castle Ruins, during the quest "A Dark Legacy"

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