Your troops on the front line and in the rearguard all need healing potions. By creating additional supply lines in the Town, you can provide your army with everything it needs. Upgrading this Knowledge increases the health of your troops when defending Towns.
| Level | Gold | Soul Shard | Time | Requirements | Troop health when defending Towns | Influence | Hero’s Experience |
| 1 | 110K | 22K | 6w 1d 00h 00m 00s | Tier VIII warrior health in Towns 1, Oracle 36 | 1% | 15K | 37.5K |
| 2 | 170K | 32.5K | 63w 6d 00h 00m 00s> 1 Year(s) | Tier VIII warrior health in Towns 2, Oracle 36 | 4% | 33K | 47.5K |
| 3 | 225K | 48K | 94w 5d 00h 00m 00s> 1 Year(s) | Tier VIII warrior health in Towns 3, Oracle 37 | 8% | 74.5K | 60K |
| 4 | 280K | 71K | 140w 5d 00h 00m 00s> 2 Year(s) | Tier VIII warrior health in Towns 4, Oracle 37 | 13% | 170K | 76K |
| 5 | 340K | 110K | 208w 6d 00h 00m 00s> 4 Year(s) | Tier VIII warrior health in Towns 5, Oracle 38 | 18% | 380K | 95.5K |
| 6 | 400K | 160K | 310w 1d 00h 00m 00s> 5 Year(s) | Tier VIII warrior health in Towns 6, Oracle 38 | 25% | 860K | 120K |
| 7 | 465K | 235K | 460w 4d 00h 00m 00s> 8 Year(s) | Tier VIII warrior health in Towns 7, Oracle 39 | 34% | 1.95M | 150K |
| 8 | 565K | 345K | 683w 6d 00h 00m 00s> 13 Year(s) | Tier VIII warrior health in Towns 8, Oracle 39 | 45% | 4.4M | 190K |
| 9 | 745K | 515K | 1 015w 4d 00h 00m 00s> 19 Year(s) | Tier VIII warrior health in Towns 9, Oracle 40 | 58% | 9.9M | 230K |
| 10 | 1.15M | 760K | 1 508w 1d 00h 00m 00s> 28 Year(s) | Tier VIII warrior health in Towns 10, Oracle 40 | 75% | 22.5M | 285K |
| 4.45M | 2.3M | 4 492w 4d 00h 00m 00s> 86 Year(s) | 75% | 40.28M | 1.29M |
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