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From The PSUPedia

Material for a grinder, used to upgrade weapon damage. Upgrades all weapon grades.

Item details

• Boards for synthesizing Grinder Ss may be purchased at MA-GRMS: Clyez for 30,000 Meseta, and have a capacity of five grinders per board.
• One of these can be obtained from The Collector by trading in either of the following materials and quantities:
  • Copernia x2
  • Olpad x2
• Three of these can be obtained by exchanging the following items at Desert Arms Shop:
  • Edel Harp x1
  • Edel Elym x1