Hard steel, morale and tactics proven in hundreds of battles — these are the qualities of an invincible army! Upgrading this Knowledge increases the defense stats of your tier I warriors.
| Level | Food | Lumber | Iron | Stone | Silver | Gold | Time | Requirements | Increased Tier I Warrior Defense | Influence | Hero’s Experience |
| 1 | 10K | 10K | 10K | 10K | 10K | 3.85K | 1d 06h 00m 00s | Oracle 8 | 1 | 250 | 7.5K |
| 2 | 20K | 20K | 20K | 20K | 20K | 4.45K | 1d 15h 00m 00s | Oracle 9 | 2 | 500 | 16K |
| 3 | 40K | 40K | 40K | 40K | 40K | 5.2K | 2d 03h 00m 00s | Oracle 9 | 3 | 1K | 27K |
| 4 | 80K | 80K | 80K | 80K | 80K | 6.1K | 2d 18h 00m 00s | Oracle 10 | 4 | 2K | 40.5K |
| 5 | 160K | 160K | 160K | 160K | 160K | 7.4K | 3d 15h 00m 00s | Oracle 10 | 5 | 4K | 57K |
| 6 | 320K | 320K | 320K | 320K | 320K | 8.95K | 4d 18h 00m 00s | Oracle 11 | 6 | 8K | 77.5K |
| 7 | 640K | 640K | 640K | 640K | 640K | 12.5K | 1w 00h 00m 00s | Oracle 11 | 7 | 16K | 105K |
| 8 | 1.3M | 1.3M | 1.3M | 1.3M | 1.3M | 13.5K | 1w 1d 00h 00m 00s | Oracle 12 | 8 | 32K | 135K |
| 9 | 2.6M | 2.6M | 2.6M | 2.6M | 2.6M | 17K | 1w 4d 00h 00m 00s | Oracle 13 | 9 | 64K | 170K |
| 10 | 5.15M | 5.15M | 5.15M | 5.15M | 5.15M | 20.5K | 2w 00h 00m 00s | Oracle 13 | 10 | 130K | 215K |
| 11 | 10.5M | 10.5M | 10.5M | 10.5M | 10.5M | 25K | 2w 4d 00h 00m 00s | Oracle 14 | 12 | 260K | 270K |
| 12 | 20.5M | 20.5M | 20.5M | 20.5M | 20.5M | 30.5K | 3w 2d 00h 00m 00s | Oracle 14 | 13 | 515K | 335K |
| 13 | 41M | 41M | 41M | 41M | 41M | 37.5K | 4w 2d 00h 00m 00s | Oracle 15 | 15 | 1.05M | 410K |
| 14 | 82M | 82M | 82M | 82M | 82M | 45.5K | 5w 3d 00h 00m 00s | Oracle 15 | 17 | 2.05M | 500K |
| 15 | 165M | 165M | 165M | 165M | 165M | 57.5K | 7w 1d 00h 00m 00s | Oracle 16 | 20 | 4.1M | 610K |
| 329.32M | 329.32M | 329.32M | 329.32M | 329.32M | 295.45K | 30w 5d 03h 00m 00s | 20 | 8.23M | 2.98M |
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