“Enhances Iron Output at Ironworks”
| Level | Requirements | Bread | Wood | Stone | Iron | Gold | Upgrade Time | Power | Bonus |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Academy Lv. 10, Bread Output II Lv. 1, Wood Output II Lv. 1 | 13,000 | 13,000 | 2,700 | 670 | 800 | 00:02:15 | 2,080 | +8.00% Iron Output |
| 2 | Academy Lv. 11, Iron Output I Lv. 1 | 18,000 | 18,000 | 3,700 | 940 | 1,100 | 00:03:22 | 2,080 | +8.00% Iron Output |
| 3 | Academy Lv. 12 Iron Output I Lv. 2 | 40,000 | 40,000 | 8,100 | 2,000 | 2,400 | 00:09:00 | 2,860 | +11.00% Iron Output |