Essence of Varmundt's Concentration.
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CON +2
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For each 20 base CON:
ATK +4, P.ATK +2
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[Enchanted Equipment's Grade]
For each 20 base CON:
[Grade D]: P.ATK +1
[Grade C]: P.ATK +1
[Grade B]: P.ATK +1
[Grade A]: P.ATK +2