The Knowledge allows the construction of a new type of siege engine – the Ballistae. Seize the opportunity to strengthen your siege troops with these daunting units!
| Level | Food | Lumber | Iron | Stone | Silver | Gold | Time | Requirements | Unlock Ballistae | Influence | Hero’s Experience |
| 1 | 1.8M | 1.8M | 1.35M | 1.8M | 4.35M | 250K | 25w 5d 00h 00m 00s | -1 | 220K | 300K |
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