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 Demon offense.
| Level | Lumber | Iron | Stone | Silver | Gold | Time | Requirements | Increased Demon Offense | Influence | Hero’s Experience | Shaman's Experience |
| 1 | 8.55M | 6.85M | 10.5M | 17.5M | 31.5K | 03h 30m 00s | 1% | 16K | 100K | 100K | |
| 2 | 8.85M | 7.05M | 11M | 18M | 43K | 06h 30m 00s | Valkyries' Citadel 21 | 11.5% | 865K | 150K | 150K |
| 3 | 9.55M | 7.65M | 11.5M | 19.5M | 56K | 14h 00m 00s | Valkyries' Citadel 21 | 22% | 1.8M | 200K | 200K |
| 4 | 12M | 9.5M | 14.5M | 24M | 71.5K | 1d 15h 00m 00s | 32.5% | 2.95M | 260K | 260K | |
| 5 | 18M | 14.5M | 21.5M | 35.5M | 94.5K | 4d 06h 00m 00s | Valkyries' Citadel 23 | 43% | 4.6M | 350K | 350K |
| 6 | 30M | 24M | 36M | 60M | 130K | 1w 3d 00h 00m 00s | Valkyries' Citadel 23 | 54% | 7.15M | 485K | 485K |
| 7 | 52M | 41.5M | 62M | 105M | 185K | 2w 5d 00h 00m 00s | Valkyries' Citadel 24 | 65.5% | 11.5M | 700K | 700K |
| 8 | 87.5M | 70M | 105M | 175M | 270K | 5d 00h 00m 00s | 82% | 17M | 1.05M | 1.05M | |
| 9 | 145M | 115M | 175M | 285M | 390K | 8w 3d 00h 00m 00s | Valkyries' Citadel 25 | 115% | 26M | 1.5M | 1.5M |
| 10 | 225M | 180M | 270M | 445M | 560K | 13w 3d 00h 00m 00s | 190% | 38M | 2.15M | 2.15M | |
| 596.45M | 476.05M | 717M | 1.18B | 1.83M | 27w 4d 21h 00m 00s | 190% | 109.88M | 6.95M | 6.95M |
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