What quest drops them?
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I originally saw a video , I think its from the JP version that mentions that you can craft them From Zig directly. As far at to were , or How they drop, I haven't got a clue.
I checked the quest logs for the two ultimate quests on ship 3. Other than various 14* eggs, there is nothing listed.
I would love to know what weapons could drop there...
They are a myth. Luther, Elder, Apprentice, and MB3 are suppose to drop em, but are so ultra rare that on the JP server during the Ep4 season only 50 would have em out of whole server of thousands.
They are nothing more than novelty weapons as they are quickly overshadowed by 15 star weapons that came later on. Not worth trying to farm.