Studying the plans of Fortresses and secret annals about sieges has helped warlords to develop new tactics that will allow them to achieve better results with fewer casualties. Upgrading this Knowledge increases your army's defense in battles for Fortresses.
| Level | Gold | Soul Shard | Time | Requirements | Troop Defense in Fortresses | Influence | Hero’s Experience | ||||||||
| 1 | 140K | 28K | 54w 6d 00h 00m 00s> 1 Year(s) | Troop Defense When Guarding Fortresses II 1, Oracle 36 | 1% | 19K | 48.5K | ||||||||
| 2 | 215K | 41K | 81w 2d 00h 00m 00s> 1 Year(s) | Troop Defense When Guarding Fortresses II 2, Oracle 36 | 3% | 43K | 61K | ||||||||
| 3 | 285K | 61K | 120w 5d 00h 00m 00s> 2 Year(s) | Troop Defense When Guarding Fortresses II 3, Oracle 37 | 6% | 97K | 77K | ||||||||
| 4 | 360K | 90.5K | 179w 2d 00h 00m 00s> 3 Year(s) | Troop Defense When Guarding Fortresses II 4, Oracle 37 | 9% | 220K | 97K | ||||||||
| 5 | 430K | 135K | 266w 1d 00h 00m 00s> 5 Year(s) | Troop Defense When Guarding Fortresses II 5, Oracle 37 | 14% | 495K | 125K | ||||||||
| 6 | 505K | 200K | 395w 2d 00h 00m 00s> 7 Year(s) | Troop Defense When Guarding Fortresses II 6, Oracle 38 | 19% | 1.15M | 155K | ||||||||
| 7 | 595K | 300K | 83w 6d 00h 00m 00s> 1 Year(s) | Troop Defense When Guarding Fortresses II 7, Oracle 38 | 25% | 2.55M | 190K | ||||||||
| 8 | 715K | 440K | 871w 4d 00h 00m 00s> 16 Year(s) | Troop Defense When Guarding Fortresses II 8, Oracle 38 | 32% | 5.7M | 235K | ||||||||
| 9 | 950K | 655K | 1 294w 2d 00h 00m 00s> 24 Year(s) | Troop Defense When Guarding Fortresses II 9, Oracle 39 | 40% | 13M | 290K | ||||||||
| 10 | 1.45M | 5.65M | 970K | 2.92M | 274w 4d 00h 00m 00s> 5 Year(s) | 3 621w 6d 00h 00m 00s> 69 Year(s) | Troop Defense When Guarding Fortresses II 10, Oracle 39 | 50% | 50% | 29M | 52.27M | 355K | 1.63M |
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