Units ATK IV
Increase units' ATK
Max level: 5
Research levels
| Level |  Power |  Food |  Iron |  Coin | Base research time | Requirements |
|---|---|---|---|---|---|---|
| 1 | 4,700 | 3,043,900 | 3,043,900 | 9,131,600 | 2 days 18 hr 4 min |
|
| 2 | 10,000 | 3,957,000 | 3,957,000 | 11,871,100 | 4 days 16 hr 18 min |
|
| 3 | 17,000 | 6,924,800 | 6,924,800 | 20,774,400 | 7 days 11 hr 40 min |
|
| 4 | 24,000 | 6,924,800 | 6,924,800 | 20,774,400 | 7 days 11 hr 40 min |
|
| 5 | 31,700 | 8,309,700 | 8,309,700 | 24,929,200 | 11 days 5 hr 30 min |
|