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 | Gold | Soul Shard | Time | Requirements | Warrior Healing Speed | Influence | Hero’s Experience |
| 1 | 170K | 32.5K | 52w 6d 00h 00m 00s> 1 Year(s) | Valravn health 1, Valravn defense 1, Valravn offense 1, Oracle 36 | 1% | 19K | 44.5K |
| 2 | 250K | 48.5K | 78w 3d 00h 00m 00s> 1 Year(s) | Valravn health 2, Valravn defense 2, Valravn offense 2, Oracle 36 | 2% | 42K | 56.5K |
| 3 | 335K | 72K | 116w 3d 00h 00m 00s> 2 Year(s) | Valravn health 3, Valravn defense 3, Valravn offense 3, Oracle 37 | 4% | 95K | 72K |
| 4 | 420K | 110K | 172w 6d 00h 00m 00s> 3 Year(s) | Valravn health 4, Valravn defense 4, Valravn offense 4, Oracle 37 | 6% | 215K | 91.5K |
| 5 | 505K | 160K | 256w 5d 00h 00m 00s> 4 Year(s) | Valravn health 5, Valravn defense 5, Valravn offense 5, Oracle 38 | 8% | 485K | 120K |
| 6 | 590K | 235K | 381w 1d 00h 00m 00s> 7 Year(s) | Valravn health 6, Valravn defense 6, Valravn offense 6, Oracle 38 | 11% | 1.1M | 145K |
| 7 | 690K | 350K | 80w 6d 00h 00m 00s> 1 Year(s) | Valravn health 7, Valravn defense 7, Valravn offense 7, Oracle 39 | 15% | 2.5M | 185K |
| 8 | 830K | 520K | 840w 3d 00h 00m 00s> 16 Year(s) | Valravn health 8, Valravn defense 8, Valravn offense 8, Oracle 39 | 19% | 5.6M | 225K |
| 9 | 1.1M | 770K | 178w 2d 00h 00m 00s> 3 Year(s) | Valravn health 9, Valravn defense 9, Valravn offense 9, Oracle 40 | 24% | 13M | 280K |
| 10 | 1.7M | 1.15M | 1 853w 2d 00h 00m 00s> 35 Year(s) | Valravn health 10, Valravn defense 10, Valravn offense 10, Oracle 40 | 30% | 28.5M | 345K |
| 6.59M | 3.45M | 4 011w 2d 00h 00m 00s> 76 Year(s) | 30% | 51.56M | 1.56M |
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