Where to farm Grindstone in Arknights, what to craft it from, and which operators need it.
| Stage | Drop tier | ~Sanity/ea |
|---|---|---|
| BI-8 | Usual | ≈45.0 |
| OD-8 | Usual | ≈45.0 |
| TW-8 | Usual | ≈45.0 |
| MT-9 | Usual | ≈52.5 |
| EA-6 | Usual | ≈52.5 |
| EP-8 | Usual | ≈52.5 |
| Operator | Rarity | Qty |
|---|---|---|
| Flint | 5★ | 22 |
| Pramanix | 5★ | 18 |
| Cement | 5★ | 16 |
| Tsukinogi | 5★ | 15 |
| Kichisei | 5★ | 14 |
| Lava the Purgatory | 5★ | 13 |
| Vendela | 5★ | 13 |
| Broca | 5★ | 13 |
| Skyfire | 5★ | 13 |
| Chiave | 5★ | 13 |
| Papyrus | 5★ | 13 |
| Nightingale | 6★ | 12 |
| Magallan | 6★ | 12 |
| Dusk | 6★ | 12 |
| Dorothy | 6★ | 11 |
| Shining | 6★ | 11 |
| Windflit | 5★ | 11 |
| Tequila | 5★ | 11 |
| Lee | 6★ | 10 |
| Ptilopsis | 5★ | 10 |
| 焰狐龙梓兰 | 6★ | 9 |
| Executor | 5★ | 9 |
| Rosmontis | 6★ | 7 |
| Mostima | 6★ | 7 |
| Muelsyse | 6★ | 7 |
| 贝洛内 | 6★ | 7 |
| Blemishine | 6★ | 7 |
| Saileach | 6★ | 7 |
| Surtr | 6★ | 7 |
| Schwarz | 6★ | 7 |
| Skadi the Corrupting Heart | 6★ | 7 |
| Eyjafjalla | 6★ | 7 |
| Pallas | 6★ | 7 |
| Phantom | 6★ | 7 |
| Horn | 6★ | 7 |
| Lappland | 5★ | 7 |
| Breeze | 5★ | 7 |
| Silence | 5★ | 7 |
| Lappland the Decadenza | 6★ | 6 |
| 机械师 | 6★ | 6 |
| Swire the Elegant Wit | 6★ | 6 |
| Stainless | 6★ | 6 |
| Glaucus | 5★ | 6 |
| Mayer | 5★ | 6 |
| Sesa | 5★ | 6 |
| Umiri Yahata | 5★ | 6 |
| Indra | 5★ | 6 |
| Cliffheart | 5★ | 6 |
+76 more — see all in the Arknights Calculator.
To total several operators with a crafting-aware farm plan, use the Arknights Calculator.