Take care of your warriors' health and provide them with fresh, quality provisions. If you do, you will have an army with high morale that will be ready to fight an enemy at any time. Conduct this Study to increase your army's health during a defense.
| Level | Food | Lumber | Iron | Stone | Silver | Gold | Time | Requirements | Increased Army Health During Defense | Power | Hero's Experience |
| 1 | 20K | 20K | 15K | 20K | 10K | 2.45K | 18h 00m 00s | 1% | 1K | 80K | |
| 2 | 40K | 40K | 30K | 40K | 25K | 3.8K | 1d 09h 00m 00s | Academy 22 | 3% | 2.5K | 105K |
| 3 | 80K | 80K | 60K | 80K | 62.5K | 6.65K | 2d 18h 00m 00s | Academy 22 | 6% | 6.25K | 135K |
| 4 | 160K | 160K | 120K | 160K | 160K | 13K | 6d 00h 00m 00s | Academy 22 | 10% | 16K | 165K |
| 5 | 320K | 320K | 240K | 320K | 395K | 24K | 1w 5d 00h 00m 00s | Academy 22 | 15% | 39.5K | 195K |
| 6 | 640K | 640K | 480K | 640K | 980K | 42.5K | 3w 2d 00h 00m 00s | Academy 23 | 20% | 98K | 230K |
| 7 | 1.3M | 1.3M | 960K | 1.3M | 2.45M | 79K | 6w 4d 00h 00m 00s | Academy 23 | 25% | 245K | 265K |
| 8 | 2.6M | 2.6M | 1.95M | 2.6M | 6.15M | 155K | 13w 3d 00h 00m 00s | Academy 23 | 30% | 615K | 305K |
| 9 | 5.15M | 5.15M | 3.85M | 5.15M | 15.5M | 290K | 27w 00h 00m 00s | Academy 23 | 35% | 1.55M | 345K |
| 10 | 10.5M | 10.5M | 7.7M | 10.5M | 38.5M | 555K | 54w 4d 00h 00m 00s> 1 Year(s) | Academy 23 | 40% | 3.85M | 395K |
| 11 | 20.5M | 20.5M | 15.5M | 20.5M | 95.5M | 1.1M | 110w 3d 00h 00m 00s> 2 Year(s) | Academy 24 | 45% | 9.55M | 440K |
| 12 | 41M | 41M | 31M | 41M | 240M | 2.05M | 223w 5d 00h 00m 00s> 4 Year(s) | Academy 24 | 50% | 24M | 495K |
| 13 | 82M | 82M | 61.5M | 82M | 600M | 3.95M | 452w 6d 00h 00m 00s> 8 Year(s) | Academy 24 | 55% | 60M | 550K |
| 14 | 165M | 165M | 125M | 165M | 1.5B | 7.65M | 917w 00h 00m 00s> 17 Year(s) | Academy 25 | 65% | 150M | 615K |
| 15 | 330M | 330M | 250M | 330M | 3.75B | 15M | 1 856w 6d 00h 00m 00s> 35 Year(s) | Academy 25 | 100% | 375M | 680K |
| 659.31M | 659.31M | 498.41M | 659.31M | 6.25B | 30.92M | 3 668w 6d 21h 00m 00s> 70 Year(s) | 100% | 624.97M | 5M |
English