The opportunity to capture a strategically important location unites warriors, and the chance to make their mark on history in a grand battle strengthens their martial spirit! Upgrading this Knowledge increases your troops' defense when attacking Fortresses.
| Level | Gold | Soul Shard | Time | Requirements | Troop Defense When Capturing Fortresses | Influence | Hero’s Experience |
| 1 | 140K | 28K | 54w 6d 00h 00m 00s> 1 Year(s) | Tier VIII warrior health in Fortresses 1, Oracle 36 | 1% | 16K | 40K |
| 2 | 215K | 41K | 81w 2d 00h 00m 00s> 1 Year(s) | Tier VIII warrior health in Fortresses 2, Oracle 36 | 6% | 35.5K | 50.5K |
| 3 | 285K | 61K | 120w 5d 00h 00m 00s> 2 Year(s) | Tier VIII warrior health in Fortresses 3, Oracle 37 | 11% | 80.5K | 64K |
| 4 | 360K | 90.5K | 179w 2d 00h 00m 00s> 3 Year(s) | Tier VIII warrior health in Fortresses 4, Oracle 37 | 18% | 185K | 80.5K |
| 5 | 430K | 135K | 266w 1d 00h 00m 00s> 5 Year(s) | Tier VIII warrior health in Fortresses 5, Oracle 37 | 26% | 410K | 105K |
| 6 | 505K | 200K | 395w 2d 00h 00m 00s> 7 Year(s) | Tier VIII warrior health in Fortresses 6, Oracle 38 | 37% | 925K | 130K |
| 7 | 595K | 300K | 83w 6d 00h 00m 00s> 1 Year(s) | Tier VIII warrior health in Fortresses 7, Oracle 38 | 49% | 2.1M | 160K |
| 8 | 715K | 440K | 871w 4d 00h 00m 00s> 16 Year(s) | Tier VIII warrior health in Fortresses 8, Oracle 38 | 63% | 4.75M | 195K |
| 9 | 950K | 655K | 1 294w 2d 00h 00m 00s> 24 Year(s) | Tier VIII warrior health in Fortresses 9, Oracle 39 | 80% | 11M | 240K |
| 10 | 1.45M | 970K | 274w 4d 00h 00m 00s> 5 Year(s) | Tier VIII warrior health in Fortresses 10, Oracle 39 | 100% | 24M | 295K |
| 5.65M | 2.92M | 3 621w 6d 00h 00m 00s> 69 Year(s) | 100% | 43.5M | 1.36M |
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