"As the heroes conquer the Isle, they will unlock the powerful Lightning Forge, which will allow Blacksmiths to forge mighty raid-worthy items, as well as classic weapons from the past."
This is a forge where you will craft Patch 5.2 weapons, it seems only to be available for blacksmith, but seeing there is forges in there maybe miners get something aswell!
Discuss here what you think of the Lightning Forge!
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Video of Lightning Forge: