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 Trebuchet offense.
| Level | Food | Iron | Stone | Silver | Gold | Time | Requirements | Increased Trebuchet Offense | Influence | Hero’s Experience | Shaman's Experience |
| 1 | 565K | 470K | 375K | 940K | 2.8K | 00h 15m 00s | Valkyries' Citadel 1 | 1% | 250 | 7.5K | 7.5K |
| 2 | 605K | 505K | 405K | 1.05M | 3.9K | 00h 35m 00s | Valkyries' Citadel 2 | 5.5% | 13.5K | 21K | 21K |
| 3 | 710K | 595K | 475K | 1.2M | 5K | 01h 30m 00s | Valkyries' Citadel 3 | 10% | 27.5K | 35.5K | 35.5K |
| 4 | 1.1M | 880K | 705K | 1.8M | 6.45K | 05h 00m 00s | Valkyries' Citadel 5 | 14% | 45.5K | 54K | 54K |
| 5 | 1.95M | 1.65M | 1.3M | 3.25M | 8.5K | 13h 00m 00s | Valkyries' Citadel 6 | 18.5% | 71K | 80K | 80K |
| 6 | 3.75M | 3.15M | 2.5M | 6.25M | 12K | 1d 06h 00m 00s | Valkyries' Citadel 7 | 23% | 110K | 125K | 125K |
| 7 | 7M | 5.85M | 4.65M | 12M | 17K | 2d 09h 00m 00s | Valkyries' Citadel 8 | 28% | 175K | 185K | 185K |
| 8 | 12.5M | 10.5M | 8.2M | 20.5M | 24K | 4d 09h 00m 00s | Valkyries' Citadel 10 | 35% | 265K | 280K | 280K |
| 9 | 20.5M | 17.5M | 14M | 34.5M | 35K | 1w 1d 00h 00m 00s | Valkyries' Citadel 11 | 48.5% | 400K | 420K | 420K |
| 10 | 32.5M | 27M | 22M | 54M | 50K | 1w 5d 00h 00m 00s | Valkyries' Citadel 12 | 80% | 590K | 610K | 610K |
| 81.18M | 68.1M | 54.61M | 135.49M | 164.65K | 4w 20h 20m 00s | 80% | 1.7M | 1.82M | 1.82M |
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