Promethium Armor can be crafted from Promethium Bars and Promethium Moulds, which is dropped by the Skeleton King at Dungeon Coffin.

Piece Mould PromethiumBars.png Defence.png Crafting Level
PromethiumHelmet.png PromethiumHelmetMould.png 300 8 600 CraftingSkill.png
PromethiumBody.png PromethiumBodyMould.png 800 12 600 CraftingSkill.png
PromethiumLegs.png PromethiumLegsMould.png 500 10 600 CraftingSkill.png
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