2nd Quest: Mithril Ore (Ruby, the armorer)

Task

I need something to reinforce the shape of the iridescent dragon scale.
However, I can not use ordinary metal or it will sacrifice the properties of
the scale. Ages past, dwarves discovered a type of ore that they named
mithril. The dwarven miners use to be quite friendly and would openly trade
the precious metal. However, I've heard stories that their appearance and
manner has drastically changed. No matter, find me some mithril so I may
reinforce this dragon scale.

Walkthrough

(from Samsera center)
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get block