Forgekeeper Secrets - Viridian

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I've been playing the game, just as I always do, and decided to join the Forgekeepers, in hopes of getting more hammers and finding obtaining more weapons on the side. It seems I need something called Forgekeeper Secrets - Viridian, but I have, like, no idea what it does or where it could even be. If any of you guys could help me with that, it'd be a great help. c:

 

Regards,

Linzen the Lyn, Yehara server