After returning from Helheim, it's hard for Vikings to get used to daylight. But your healers have found a way to help them readjust to their homeworld faster. Upgrading this Knowledge increases the training speed of tier VIII warriors.
| Level | Gold | Soul Shard | Time | Requirements | Tier VIII Warrior Training Speed | Influence | Hero’s Experience |
| 1 | 110K | 21K | 52w 6d 00h 00m 00s> 1 Year(s) | Unlock Nidhoggs 1, Oracle 36 | 1% | 19K | 44.5K |
| 2 | 165K | 31.5K | 78w 3d 00h 00m 00s> 1 Year(s) | Unlock Nidhoggs 1, Oracle 36 | 3% | 42K | 56.5K |
| 3 | 220K | 46.5K | 116w 3d 00h 00m 00s> 2 Year(s) | Unlock Nidhoggs 1, Oracle 37 | 6% | 95K | 72K |
| 4 | 275K | 69K | 172w 6d 00h 00m 00s> 3 Year(s) | Unlock Nidhoggs 1, Oracle 37 | 9% | 215K | 91.5K |
| 5 | 330K | 105K | 256w 5d 00h 00m 00s> 4 Year(s) | Unlock Nidhoggs 1, Oracle 38 | 12% | 485K | 120K |
| 6 | 385K | 155K | 381w 1d 00h 00m 00s> 7 Year(s) | Unlock Nidhoggs 1, Oracle 38 | 15% | 1.1M | 145K |
| 7 | 450K | 230K | 80w 6d 00h 00m 00s> 1 Year(s) | Unlock Nidhoggs 1, Oracle 39 | 19% | 2.5M | 185K |
| 8 | 540K | 335K | 840w 3d 00h 00m 00s> 16 Year(s) | Unlock Nidhoggs 1, Oracle 39 | 24% | 5.6M | 225K |
| 9 | 715K | 500K | 178w 2d 00h 00m 00s> 3 Year(s) | Unlock Nidhoggs 1, Oracle 40 | 29% | 13M | 280K |
| 10 | 1.1M | 740K | 1 853w 2d 00h 00m 00s> 35 Year(s) | Unlock Nidhoggs 1, Oracle 40 | 35% | 28.5M | 345K |
| 4.29M | 2.23M | 4 011w 2d 00h 00m 00s> 76 Year(s) | 35% | 51.56M | 1.56M |
English