Some cavalry returned to the world of the living, but their bodies had changed monstrously. They no longer feel pain, and even if they suffer a deadly blow, they continue fighting. Upgrading this Knowledge increases the health of your Helhests.
| Level | Gold | Soul Shard | Time | Requirements | Helhest Health | Influence | Hero’s Experience |
| 1 | 125K | 24.5K | 52w 6d 00h 00m 00s> 1 Year(s) | Helhest defense 1, Oracle 36 | 1% | 19K | 44.5K |
| 2 | 190K | 36.5K | 78w 3d 00h 00m 00s> 1 Year(s) | Helhest defense 2, Oracle 36 | 7% | 42K | 56.5K |
| 3 | 255K | 54.5K | 116w 3d 00h 00m 00s> 2 Year(s) | Helhest defense 3, Oracle 37 | 13% | 95K | 72K |
| 4 | 315K | 80.5K | 172w 6d 00h 00m 00s> 3 Year(s) | Helhest defense 4, Oracle 37 | 20% | 215K | 91.5K |
| 5 | 380K | 120K | 256w 5d 00h 00m 00s> 4 Year(s) | Helhest defense 5, Oracle 38 | 30% | 485K | 120K |
| 6 | 445K | 180K | 381w 1d 00h 00m 00s> 7 Year(s) | Helhest defense 6, Oracle 38 | 41% | 1.1M | 145K |
| 7 | 515K | 265K | 80w 6d 00h 00m 00s> 1 Year(s) | Helhest defense 7, Oracle 39 | 56% | 2.5M | 185K |
| 8 | 625K | 395K | 840w 3d 00h 00m 00s> 16 Year(s) | Helhest defense 8, Oracle 39 | 75% | 5.6M | 225K |
| 9 | 820K | 580K | 178w 2d 00h 00m 00s> 3 Year(s) | Helhest defense 9, Oracle 40 | 97% | 13M | 280K |
| 10 | 1.25M | 865K | 1 853w 2d 00h 00m 00s> 35 Year(s) | Helhest defense 10, Oracle 40 | 130% | 28.5M | 345K |
| 4.92M | 2.6M | 4 011w 2d 00h 00m 00s> 76 Year(s) | 130% | 51.56M | 1.56M |
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