Laying siege to Towns and capturing resources can cost a fortune. To retain your valuable warriors, you need to improve the penetrative power of your siege engines. In the Valkyries' Citadel, you can increase your Polybolos offense.
| Level | Food | Iron | Stone | Silver | Gold | Time | Requirements | Increased Polybolos Offense | Influence | Hero’s Experience | Shaman's Experience |
| 1 | 14.5M | 12M | 9.4M | 23.5M | 45.5K | 05h 00m 00s | 1% | 50K | 130K | 130K | |
| 2 | 15M | 12.5M | 9.7M | 24.5M | 62.5K | 11h 00m 00s | Valkyries' Citadel 23 | 13% | 2.7M | 160K | 160K |
| 3 | 16M | 13.5M | 10.5M | 26.5M | 81K | 1d 03h 00m 00s | Valkyries' Citadel 24 | 25.5% | 5.5M | 190K | 190K |
| 4 | 20M | 16.5M | 13.5M | 33M | 105K | 3d 03h 00m 00s | 37.5% | 9.05M | 225K | 225K | |
| 5 | 29.5M | 24.5M | 19.5M | 49M | 140K | 1w 2d 00h 00m 00s | Valkyries' Citadel 26 | 49.5% | 14.5M | 280K | 280K |
| 6 | 49.5M | 41M | 33M | 82M | 190K | 2w 5d 00h 00m 00s | Valkyries' Citadel 27 | 62% | 22M | 360K | 360K |
| 7 | 85.5M | 71M | 57M | 145M | 270K | 5w 3d 00h 00m 00s | Valkyries' Citadel 28 | 76% | 34.5M | 490K | 490K |
| 8 | 145M | 120M | 96M | 240M | 390K | 1w 3d 00h 00m 00s | 95% | 53M | 680K | 680K | |
| 9 | 235M | 200M | 160M | 395M | 565K | 16w 5d 00h 00m 00s | Valkyries' Citadel 30 | 130% | 79.5M | 960K | 960K |
| 10 | 365M | 305M | 245M | 610M | 810K | 26w 5d 00h 00m 00s | 220% | 120M | 1.35M | 1.35M | |
| 975M | 816M | 653.6M | 1.63B | 2.66M | 54w 6d 22h 00m 00s> 1 Year(s) | 220% | 340.8M | 4.83M | 4.83M |
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