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 Slingers' 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 Slingers' defense. | Power | Hero's Experience |
| 1 | 470K | 565K | 375K | 940K | 2.8K | 00h 15m 00s | Alchemical Laboratory 1 | 1% | 250 | 7.5K |
| 2 | 505K | 605K | 405K | 1.05M | 4.55K | 00h 35m 00s | Alchemical Laboratory 2 | 5.5% | 13.5K | 21K |
| 3 | 595K | 710K | 475K | 1.2M | 6.35K | 01h 30m 00s | Alchemical Laboratory 3 | 10% | 27.5K | 35.5K |
| 4 | 880K | 1.1M | 705K | 1.8M | 8.65K | 05h 00m 00s | Alchemical Laboratory 5 | 15.5% | 45.5K | 54K |
| 5 | 1.65M | 1.95M | 1.3M | 3.25M | 12K | 13h 00m 00s | Alchemical Laboratory 6 | 22% | 71K | 80K |
| 6 | 3.15M | 3.75M | 2.5M | 6.25M | 17.5K | 1d 06h 00m 00s | Alchemical Laboratory 7 | 29.5% | 110K | 125K |
| 7 | 5.85M | 7M | 4.65M | 12M | 25.5K | 2d 09h 00m 00s | Alchemical Laboratory 8 | 39% | 175K | 185K |
| 8 | 10.5M | 12.5M | 8.2M | 20.5M | 37K | 4d 09h 00m 00s | Alchemical Laboratory 10 | 50.5% | 265K | 280K |
| 9 | 17.5M | 20.5M | 14M | 34.5M | 54.5K | 1w 1d 00h 00m 00s | Alchemical Laboratory 11 | 64% | 400K | 420K |
| 10 | 27M | 32.5M | 22M | 54M | 79K | 1w 5d 00h 00m 00s | Alchemical Laboratory 12 | 80% | 590K | 610K |
| 68.1M | 81.18M | 54.61M | 135.49M | 247.85K | 4w 20h 20m 00s | 80% | 1.7M | 1.82M |
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