After obtaining new knowledge and materials, your engineers will be able to start crafting Onagers. Conduct this Study to add Onagers to your army's arsenal.
| Level | Food | Lumber | Iron | Stone | Silver | Gold | Time | Requirements | Unlock Onagers | Power | Hero's Experience |
| 1 | 150K | 150K | 115K | 150K | 360K | 41.5K | 2w 1d 00h 00m 00s | ✓ | 17.5K | 250K |
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