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 Shadows' 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 Shadows' health reserve. | Power | Hero's Experience |
| 1 | 14.5M | 9.4M | 12M | 23.5M | 45.5K | 05h 00m 00s | 1% | 50K | 130K | |
| 2 | 15M | 9.7M | 12.5M | 24.5M | 73K | 10h 00m 00s | Alchemical Laboratory 23 | 13.5% | 2.7M | 185K |
| 3 | 16M | 10.5M | 13.5M | 26.5M | 105K | 1d 03h 00m 00s | Alchemical Laboratory 24 | 26.5% | 5.5M | 240K |
| 4 | 20M | 13.5M | 16.5M | 33M | 140K | 3d 00h 00m 00s | 41.5% | 9.05M | 305K | |
| 5 | 29.5M | 19.5M | 24.5M | 49M | 195K | 1w 1d 00h 00m 00s | Alchemical Laboratory 26 | 59.5% | 14.5M | 405K |
| 6 | 49.5M | 33M | 41M | 82M | 280K | 2w 5d 00h 00m 00s | Alchemical Laboratory 27 | 80.5% | 22M | 560K |
| 7 | 85.5M | 57M | 71M | 145M | 405K | 5w 2d 00h 00m 00s | Alchemical Laboratory 28 | 105% | 34.5M | 795K |
| 8 | 145M | 96M | 120M | 240M | 600K | 9w 4d 00h 00m 00s | 140% | 53M | 1.15M | |
| 9 | 235M | 160M | 200M | 395M | 880K | 16w 1d 00h 00m 00s | Alchemical Laboratory 30 | 175% | 79.5M | 1.7M |
| 10 | 365M | 245M | 305M | 610M | 1.3M | 25w 5d 00h 00m 00s | 220% | 120M | 2.4M | |
| 975M | 653.6M | 816M | 1.63B | 4.02M | 61w 1d 18h 00m 00s> 1 Year(s) | 220% | 340.8M | 7.87M |
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