By researching the properties of various herbs, your healers will be able to improve the recipe for a potion that helps wounds to heal faster. Upgrading this Knowledge will boost the healing speed of warriors in the Infirmary.
| Level | Food | Lumber | Iron | Stone | Silver | Gold | Manuscript | Time | Requirements | Increased Warrior Healing Speed | Influence | Hero’s Experience |
| 1 | 4.5M | 4.5M | 4.5M | 4.5M | 4.5M | 96.5K | - | 5w 00h 00m 00s | 2 | 300K | 130K | |
| 2 | 6.65M | 6.65M | 6.65M | 6.65M | 7.5M | 130K | - | 7w 2d 00h 00m 00s | Oracle 20 | 5 | 500K | 155K |
| 3 | 9.75M | 9.75M | 9.75M | 9.75M | 12.5M | 170K | - | 10w 4d 00h 00m 00s | Oracle 22 | 9 | 835K | 180K |
| 4 | 14.5M | 14.5M | 14.5M | 14.5M | 21M | 230K | - | 15w 2d 00h 00m 00s | Oracle 24 | 16 | 1.4M | 205K |
| 5 | 21M | 21M | 21M | 21M | 34.5M | 305K | - | 22w 1d 00h 00m 00s | 24 | 2.35M | 230K | |
| 6 | 31M | 31M | 31M | 31M | 57.5M | 410K | - | 32w 00h 00m 00s | Oracle 26 | 35 | 3.85M | 260K |
| 7 | 45.5M | 45.5M | 45.5M | 45.5M | 95M | 560K | 565 | 46w 3d 00h 00m 00s | Oracle 27 | 47 | 6.4M | 295K |
| 8 | 66.5M | 66.5M | 66.5M | 66.5M | 160M | 760K | 820 | 67w 3d 00h 00m 00s> 1 Year(s) | 62 | 11M | 330K | |
| 9 | 97.5M | 97.5M | 97.5M | 97.5M | 265M | 1.05M | 1 200 | 97w 6d 00h 00m 00s> 1 Year(s) | 80 | 18M | 365K | |
| 10 | 145M | 145M | 145M | 145M | 440M | 1.45M | 1 750 | 142w 00h 00m 00s> 2 Year(s) | 100 | 29.5M | 410K | |
| 441.9M | 441.9M | 441.9M | 441.9M | 1.1B | 5.16M | 4.34K | 446w 00h 00m 00s> 8 Year(s) | 100 | 74.14M | 2.56M |
English