The life of northern warriors is an endless string of battles. Bravery and fury, along with improved battle skills, guarantee a glorious victory. In the Valkyries' Citadel, you can increase your Berserker offense.
| Level | Lumber | Iron | Stone | Silver | Gold | Time | Requirements | Increased Berserker Offense | Influence | Hero’s Experience | Shaman's Experience |
| 1 | 5.75M | 4.6M | 6.9M | 11.5M | 19.5K | 02h 30m 00s | 1% | 4K | 80K | 80K | |
| 2 | 5.95M | 4.75M | 7.1M | 12M | 27K | 04h 00m 00s | Valkyries' Citadel 17 | 10% | 215K | 120K | 120K |
| 3 | 6.4M | 5.15M | 7.7M | 13M | 34.5K | 07h 30m 00s | Valkyries' Citadel 17 | 18.5% | 445K | 160K | 160K |
| 4 | 7.95M | 6.4M | 9.55M | 16M | 44.5K | 21h 00m 00s | 27.5% | 730K | 205K | 205K | |
| 5 | 12M | 9.5M | 14.5M | 24M | 58.5K | 2d 03h 00m 00s | Valkyries' Citadel 19 | 36.5% | 1.15M | 275K | 275K |
| 6 | 20M | 16M | 24M | 40M | 80.5K | 4d 18h 00m 00s | Valkyries' Citadel 19 | 45.5% | 1.8M | 385K | 385K |
| 7 | 35M | 28M | 41.5M | 69.5M | 115K | 1w 3d 00h 00m 00s | Valkyries' Citadel 20 | 55.5% | 2.75M | 555K | 555K |
| 8 | 59M | 47M | 70.5M | 120M | 170K | 2w 4d 00h 00m 00s | 69.5% | 4.25M | 810K | 810K | |
| 9 | 95.5M | 76.5M | 115M | 195M | 240K | 4w 2d 00h 00m 00s | Valkyries' Citadel 21 | 96% | 6.4M | 1.2M | 1.2M |
| 10 | 150M | 120M | 180M | 300M | 345K | 6w 5d 00h 00m 00s | 160% | 9.45M | 1.7M | 1.7M | |
| 397.55M | 317.9M | 476.75M | 801M | 1.13M | 16w 1d 08h 00m 00s | 160% | 27.19M | 5.49M | 5.49M |
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