“Enhances Stone Gathering Speed”
| Level | Requirements | Bread | Wood | Stone | Iron | Gold | Upgrade Time | Power | Bonus |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Academy Lv. 26, Iron Output IV Lv. 1 | 930,000 | 930,000 | 180,000 | 46,000 | 12,000 | 07:46:40 | 2,000 | +16.00% Stone Gathering Speed |
| 2 | Stone Mining IV Lv. 1 | 1,300,000 | 1,300,000 | 260,000 | 65,000 | 16,000 | 11:40:00 | 2,000 | +16.00% Stone Gathering Speed |
| 3 | Stone Mining IV Lv. 2 | 2,700,000 | 2,700,000 | 550,000 | 130,000 | 36,000 | 1d 07:06:40 | 2,687 | +21.50% Stone Gathering Speed |