Warriors who deal with siege engines often get injured while reloading the weapons. A decoction made from Lapius expidus root will make their ligaments and muscles stronger. This upgrade will increase your Trebuchets' health reserve.
| Level | Food | Iron | Stone | Silver | Gold | Time | Requirements | Warriors who deal with siege engines often get injured while reloading the weapons. A decoction made from Lapius expidus root will make their ligaments and muscles stronger. This upgrade will increase your Trebuchets' health reserve. | Power | Hero's Experience |
| 1 | 10.5M | 8.55M | 6.85M | 17.5M | 31.5K | 03h 30m 00s | 1% | 16K | 100K | |
| 2 | 11M | 8.85M | 7.05M | 18M | 50.5K | 06h 00m 00s | Alchemical Laboratory 21 | 11.5% | 865K | 150K |
| 3 | 11.5M | 9.55M | 7.65M | 19.5M | 71K | 14h 00m 00s | Alchemical Laboratory 21 | 23% | 1.8M | 200K |
| 4 | 14.5M | 12M | 9.5M | 24M | 96.5K | 1d 15h 00m 00s | 36% | 2.95M | 260K | |
| 5 | 21.5M | 18M | 14.5M | 35.5M | 135K | 4d 00h 00m 00s | Alchemical Laboratory 23 | 51.5% | 4.6M | 350K |
| 6 | 36M | 30M | 24M | 60M | 195K | 1w 3d 00h 00m 00s | Alchemical Laboratory 23 | 69.5% | 7.15M | 485K |
| 7 | 62M | 52M | 41.5M | 105M | 280K | 2w 5d 00h 00m 00s | Alchemical Laboratory 24 | 92% | 11.5M | 700K |
| 8 | 105M | 87.5M | 70M | 175M | 415K | 4w 6d 00h 00m 00s | 120% | 17M | 1.05M | |
| 9 | 175M | 145M | 115M | 285M | 610K | 8w 1d 00h 00m 00s | Alchemical Laboratory 25 | 150% | 26M | 1.5M |
| 10 | 270M | 225M | 180M | 445M | 880K | 12w 6d 00h 00m 00s | 190% | 38M | 2.15M | |
| 717M | 596.45M | 476.05M | 1.18B | 2.76M | 30w 6d 14h 30m 00s | 190% | 109.88M | 6.95M |
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