How one unlocks the arcane melee slot?

warframe how to unlock weapon arcane slot
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I have steel path, and have used the adaptors before, but there is no slot on any of my melee weapons

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warframe how to unlock weapon arcane slot Personally I just click on the arcane slot on the weapon and it ask if I want to buy an arcane adapter unlocked Teshin (the ConclavePvP

warframe complete starter slot bundle The Primary Arcane Adapter is a special item that can be fused with a Primary Weapon to unlock a Primary Arcane Slot, which is a special additional slot