“Enhances Stone Gathering Speed”
| Level | Requirements | Bread | Wood | Stone | Iron | Gold | Upgrade Time | Power | Bonus |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Academy Lv. 16, Iron Output II Lv. 1 | 100,000 | 100,000 | 20,000 | 5,000 | 1,200 | 00:17:30 | 1,375 | +11.00% Stone Gathering Speed |
| 2 | Academy Lv. 17, Stone Mining II Lv. 1 | 140,000 | 140,000 | 28,000 | 7,000 | 1,600 | 00:26:15 | 1,375 | +11.00% Stone Gathering Speed |
| 3 | Academy Lv. 18, Stone Mining II Lv. 2 | 300,000 | 300,000 | 60,000 | 15,000 | 3,600 | 01:10:00 | 1,812 | +14.50% Stone Gathering Speed |