Poisoned arrows and daggers are the worst enemies of any spy. If extract of Sarducus and a small dose of a dangerous substance are injected into the scouts' bloodstream, this will quickly improve their immunity to poison. This upgrade will increase your Scouts' health reserve.
| Level | Lumber | Iron | Stone | Silver | Gold | Time | Requirements | Poisoned arrows and daggers are the worst enemies of any spy. If extract of Sarducus and a small dose of a dangerous substance are injected into the scouts' bloodstream, this will quickly improve their immunity to poison. This upgrade will increase your Scouts' health reserve. | Power | Hero's Experience |
| 1 | 6.9M | 4.6M | 5.75M | 11.5M | 19.5K | 02h 30m 00s | 1% | 4K | 80K | |
| 2 | 7.1M | 4.75M | 5.95M | 12M | 31.5K | 04h 00m 00s | Alchemical Laboratory 17 | 10% | 215K | 120K |
| 3 | 7.7M | 5.15M | 6.4M | 13M | 44K | 07h 30m 00s | Alchemical Laboratory 17 | 19.5% | 445K | 160K |
| 4 | 9.55M | 6.4M | 7.95M | 16M | 60K | 21h 00m 00s | 30.5% | 730K | 205K | |
| 5 | 14.5M | 9.5M | 12M | 24M | 82.5K | 2d 03h 00m 00s | Alchemical Laboratory 19 | 43.5% | 1.15M | 275K |
| 6 | 24M | 16M | 20M | 40M | 120K | 4d 15h 00m 00s | Alchemical Laboratory 19 | 59% | 1.8M | 385K |
| 7 | 41.5M | 28M | 35M | 69.5M | 175K | 1w 3d 00h 00m 00s | Alchemical Laboratory 20 | 77.5% | 2.75M | 555K |
| 8 | 70.5M | 47M | 59M | 120M | 260K | 2w 3d 00h 00m 00s | 100% | 4.25M | 810K | |
| 9 | 115M | 76.5M | 95.5M | 195M | 380K | 4w 1d 00h 00m 00s | Alchemical Laboratory 21 | 130% | 6.4M | 1.2M |
| 10 | 180M | 120M | 150M | 300M | 550K | 6w 3d 00h 00m 00s | 160% | 9.45M | 1.7M | |
| 476.75M | 317.9M | 397.55M | 801M | 1.72M | 15w 4d 05h 00m 00s | 160% | 27.19M | 5.49M |
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