| Item Name | Whetstone (砥石) |
| Max Carry | 20 |
| Buy Price | 80z |
| Sell Price | 8z |
| Rarity | 1 |
| How to Get | Gathering, Mining, Purchase |
| Description | Used to recover weapon sharpness; Basic item for combining Boomerang; |
| First Item | Second Item | Item Result | Chance | Qty Result |
| Whetstone (砥石) | Monster Bone S (竜骨【小】) | Boomerang (ブーメラン) | 75% | 1 |
| Bone Husk S (カラ骨【小】) | Whetstone (砥石) | Empty bottle (空きビン) | 90% | 1 |
| Area Name | Rank | Spot No | ||||||
| Deserted Island |
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| Flooded Forest |
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| Sandy Plains |
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| Tundra |
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| Volcano |
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| Misty Peaks |
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| Moga Village |
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