Arcane Enchantments

See, every Primary Weapon has one Primary Arcane Slot for Arcane Enhancements, but you can't access the slot by default By fusing a Primay

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warframe slot bundle it says 5 open slots So that's how many open slots I have currently Same thing with your

warframe how to unlock weapon arcane slot Slot Weapons, Core Hound Tooth, One-Hand Eskhandar's Right Claw, Main Hand Greater Arcane Elixir: Another spell damage increase any caster would benefit