A common goal unites and emboldens. Warriors won't flinch in the face of danger and will furiously fight to the last breath! Upgrading this Knowledge increases your troops' offense when guarding Fortresses.
| Level | Gold | Soul Shard | Time | Requirements | Troop Offense When Guarding Fortresses | Influence | Hero’s Experience |
| 1 | 105K | 21K | 41w 1d 00h 00m 00s | Troop Offense When Capturing Fortresses I 1, Oracle 36 | 1% | 19K | 48.5K |
| 2 | 160K | 31K | 8w 5d 00h 00m 00s | Troop Offense When Capturing Fortresses I 2, Oracle 36 | 4% | 43K | 61K |
| 3 | 215K | 46K | 90w 4d 00h 00m 00s> 1 Year(s) | Troop Offense When Capturing Fortresses I 3, Oracle 36 | 8% | 97K | 77K |
| 4 | 270K | 68K | 134w 3d 00h 00m 00s> 2 Year(s) | Troop Offense When Capturing Fortresses I 4, Oracle 37 | 13% | 220K | 97K |
| 5 | 325K | 105K | 199w 5d 00h 00m 00s> 3 Year(s) | Troop Offense When Capturing Fortresses I 5, Oracle 37 | 19% | 495K | 125K |
| 6 | 380K | 150K | 296w 3d 00h 00m 00s> 5 Year(s) | Troop Offense When Capturing Fortresses I 6, Oracle 37 | 26% | 1.15M | 155K |
| 7 | 445K | 225K | 440w 2d 00h 00m 00s> 8 Year(s) | Troop Offense When Capturing Fortresses I 7, Oracle 37 | 34% | 2.55M | 190K |
| 8 | 540K | 330K | 653w 5d 00h 00m 00s> 12 Year(s) | Troop Offense When Capturing Fortresses I 8, Oracle 38 | 45% | 5.7M | 235K |
| 9 | 710K | 490K | 970w 5d 00h 00m 00s> 18 Year(s) | Troop Offense When Capturing Fortresses I 9, Oracle 38 | 56% | 13M | 290K |
| 10 | 1.1M | 730K | 1 441w 3d 00h 00m 00s> 27 Year(s) | Troop Offense When Capturing Fortresses I 10, Oracle 38 | 70% | 29M | 355K |
| 4.25M | 2.2M | 4 277w 1d 00h 00m 00s> 81 Year(s) | 70% | 52.27M | 1.63M |
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