A special abrasive made by Gray Blacksmith.
It was made to be suitable for physical Thanos' and Thanos'-AD weapons.
Both Refine Level and card are preserved.
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[Gray weapon list]
Thanos Sword
Thanos Greatsword
Thanos Spear
Thanos Two-Handed Spear
Thanos Dagger
Thanos Katar
Thanos Knuckle
Thanos Hammer
Thanos Axe
Thanos Whip
Thanos Violin
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Weight: 5