Hammer heart
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Trovehunter Krazig Gorinsson scours the library, and any tomes within the dwarven embassy looking for any mention of 'Hammer Heart'
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The Librarian appears puzzled, but does mention that there was once over two decades ago an adventuring group, who were said to have freed a Netherese man or spirit from the ruins using a legendary hammer heart. Rumours had it soon afterwards that the hammer heart had been lost in the Underdark.