Thanks to new armor of tempered steel, your scouts will be well protected. This will reduce the number of those wounded in battle and increase your chances of victory! Upgrading this Knowledge improves the defensive stats of your scouts.
| Level | Gold | Soul Shard | Time | Requirements | Increased Scout Defense | Influence | Hero’s Experience |
| 1 | 570K | 10.5K | 48w 6d 00h 00m 00s | Oracle 31, Defense Against Tier VII in Fortresses 1 | 1% | 160K | 510K |
| 2 | 710K | 15.5K | 72w 4d 00h 00m 00s> 1 Year(s) | Oracle 31, Defense Against Tier VII in Fortresses 1 | 8% | 355K | 780K |
| 3 | 850K | 23K | 107w 5d 00h 00m 00s> 2 Year(s) | Oracle 32, Defense Against Tier VII in Fortresses 2 | 15% | 800K | 1.15M |
| 4 | 990K | 34K | 159w 6d 00h 00m 00s> 3 Year(s) | Oracle 32, Defense Against Tier VII in Fortresses 3 | 23% | 1.85M | 1.55M |
| 5 | 1.15M | 50K | 237w 3d 00h 00m 00s> 4 Year(s) | Oracle 33, Defense Against Tier VII in Fortresses 4 | 32% | 4.1M | 2.1M |
| 6 | 1.3M | 74.5K | 352w 4d 00h 00m 00s> 6 Year(s) | Oracle 33, Defense Against Tier VII in Fortresses 4 | 42% | 9.2M | 2.7M |
| 7 | 1.45M | 115K | 523w 4d 00h 00m 00s> 10 Year(s) | Oracle 34, Defense Against Tier VII in Fortresses 5 | 53% | 21M | 3.5M |
| 8 | 1.7M | 165K | 777w 3d 00h 00m 00s> 14 Year(s) | Oracle 34, Defense Against Tier VII in Fortresses 6 | 67% | 47M | 4.45M |
| 9 | 2.15M | 245K | 1 154w 2d 00h 00m 00s> 22 Year(s) | Oracle 35, Defense Against Tier VII in Fortresses 7 | 82% | 110M | 5.6M |
| 10 | 3.1M | 365K | 1 714w 1d 00h 00m 00s> 32 Year(s) | Oracle 35, Defense Against Tier VII in Fortresses 10 | 100% | 240M | 7M |
| 13.97M | 1.1M | 5 148w 3d 00h 00m 00s> 98 Year(s) | 100% | 434.47M | 29.34M |
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