“Enhances Stone Gathering Speed”
| Level | Requirements | Bread | Wood | Stone | Iron | Gold | Upgrade Time | Power | Bonus |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Academy Lv. 21, Iron Output III Lv. 1 | 320,000 | 320,000 | 64,000 | 16,000 | 3,600 | 01:10:00 | 1,687 | +13.50% Stone Gathering Speed |
| 2 | Academy Lv. 22, Stone Mining III Lv. 1 | 450,000 | 450,000 | 90,000 | 22,000 | 5,000 | 01:45:00 | 1,688 | +13.50% Stone Gathering Speed |
| 3 | Academy Lv 23, Stone Mining III Lv. 2 | 970,000 | 970,000 | 190,000 | 48,000 | 10,000 | 04:40:00 | 2,250 | +18.00% Stone Gathering Speed |