“Enhances Iron Output at Ironworks”
| Level | Requirements | Bread | Wood | Stone | Iron | Gold | Upgrade Time | Power | Bonus |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Academy Lv. 25, Bread Output V Lv. 1, Stone Output IV Lv. 1, Wood Output V Lv. 1 | 1,200,000 | 1,200,000 | 240,000 | 62,000 | 16,000 | 11:06:40 | 1,820 | +7.00% Iron Output |
| 2 | Iron Output IV Lv. 1 | 1,700,000 | 1,700,000 | 340,000 | 86,000 | 22,000 | 16:40:00 | 1,690 | +6.50% Iron Output |
| 3 | Iron Output IV Lv. 2 | 3,700,000 | 3,700,000 | 740,000 | 180,000 | 48,000 | 1d 20:26:40 | 2,340 | +9.00% Iron Output |