Sturdy armor and shrewd troop positioning on the battlefield will protect your army from enemy projectiles. Conduct this Study to increase your army's defense stats when attacking Castles.
| Level | Drafts | Gold | Time | Requirements | Army defense when attacking Castles | Power |
| 1 | 250 | 41.5K | 1w 12h 00m 00s | Scholars' Hall 4 | 1 | 13M |
| 2 | 330 | 53K | 1w 3d 12h 00m 00s | - | 3 | 13M |
| 3 | 435 | 71.5K | 2w 1d 12h 00m 00s | - | 5 | 13.5M |
| 4 | 585 | 97.5K | 3w 2d 00h 00m 00s | - | 9 | 13.5M |
| 5 | 810 | 145K | 5w 2d 00h 00m 00s | - | 14 | 13.5M |
| 6 | 1 150 | 230K | 8w 6d 12h 00m 00s | - | 20 | 13.5M |
| 7 | 1 650 | 380K | 15w 5d 12h 00m 00s | - | 30 | 14M |
| 8 | 2 450 | 665K | 29w 3d 00h 00m 00s | - | 40 | 14M |
| 9 | 3 600 | 1.25M | 57w 4d 12h 00m 00s> 1 Year(s) | - | 50 | 14M |
| 10 | 5 500 | 2.4M | 118w 5d 12h 00m 00s> 2 Year(s) | - | 60 | 14.5M |
| 16.76K | 5.33M | 243w 6d 12h 00m 00s> 4 Year(s) | 60 | 136.5M |
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