Their experiments with metals have helped your alchemists make a light and durable material suitable for making plates that can be used to cover vulnerable spots in your ranged warriors' armor. This upgrade will increase your Crossbowmen's defense.
| Level | Food | Lumber | Stone | Silver | Gold | Time | Requirements | Their experiments with metals have helped your alchemists make a light and durable material suitable for making plates that can be used to cover vulnerable spots in your ranged warriors' armor. This upgrade will increase your Crossbowmen's defense. | Power | Hero's Experience |
| 1 | 12M | 14.5M | 9.4M | 23.5M | 45.5K | 05h 00m 00s | 1% | 50K | 130K | |
| 2 | 12.5M | 15M | 9.7M | 24.5M | 73K | 11h 00m 00s | Alchemical Laboratory 23 | 13.5% | 2.7M | 160K |
| 3 | 13.5M | 16M | 10.5M | 26.5M | 105K | 1d 03h 00m 00s | Alchemical Laboratory 24 | 26.5% | 5.5M | 190K |
| 4 | 16.5M | 20M | 13.5M | 33M | 140K | 3d 03h 00m 00s | 41.5% | 9.05M | 225K | |
| 5 | 24.5M | 29.5M | 19.5M | 49M | 195K | 1w 2d 00h 00m 00s | Alchemical Laboratory 26 | 59.5% | 14.5M | 280K |
| 6 | 41M | 49.5M | 33M | 82M | 280K | 2w 5d 00h 00m 00s | Alchemical Laboratory 27 | 80.5% | 22M | 360K |
| 7 | 71M | 85.5M | 57M | 145M | 405K | 5w 3d 00h 00m 00s | Alchemical Laboratory 28 | 105% | 34.5M | 490K |
| 8 | 120M | 145M | 96M | 240M | 600K | 1w 3d 00h 00m 00s | 140% | 53M | 680K | |
| 9 | 200M | 235M | 160M | 395M | 880K | 16w 5d 00h 00m 00s | Alchemical Laboratory 30 | 175% | 79.5M | 960K |
| 10 | 305M | 365M | 245M | 610M | 1.3M | 26w 5d 00h 00m 00s | 220% | 120M | 1.35M | |
| 816M | 975M | 653.6M | 1.63B | 4.02M | 54w 6d 22h 00m 00s> 1 Year(s) | 220% | 340.8M | 4.83M |
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