Training newly recruited warriors can be quite costly! But Knowledge has been revealed to wise Jarls! By upgrading, you can substantially cut the training cost of merciless Slayers!
| Level | Lumber | Iron | Stone | Silver | Gold | Time | Requirements | Reduced Slayer Training Cost | Influence | Hero’s Experience |
| 1 | 120 | 120 | 120 | 60 | 10 | 00h 00m 45s | 1 | 10 | 3.2K | |
| 2 | 220 | 220 | 220 | 110 | 20 | 00h 02m 05s | Oracle 4 | 1 | 15 | 6.4K |
| 3 | 390 | 390 | 390 | 195 | 45 | 00h 05m 40s | Oracle 6 | 2 | 20 | 9.6K |
| 4 | 700 | 700 | 700 | 350 | 120 | 00h 20m 00s | Oracle 8 | 2 | 35 | 12.8K |
| 5 | 1.3K | 1.3K | 1.3K | 630 | 200 | 00h 45m 00s | Oracle 10 | 3 | 65 | 16K |
| 6 | 2.3K | 2.3K | 2.3K | 1.15K | 345 | 02h 00m 00s | Oracle 12 | 4 | 115 | 19.2K |
| 7 | 4.1K | 4.1K | 4.1K | 2.05K | 615 | 05h 30m 00s | Oracle 14 | 6 | 205 | 22.4K |
| 8 | 7.35K | 7.35K | 7.35K | 3.7K | 1.25K | 15h 00m 00s | Oracle 16 | 9 | 370 | 25.6K |
| 9 | 13.5K | 13.5K | 13.5K | 6.65K | 2.9K | 1d 18h 00m 00s | Oracle 18 | 15 | 665 | 28.8K |
| 10 | 24K | 24K | 24K | 12K | 7.1K | 4d 18h 00m 00s | 40 | 1.2K | 32K | |
| 53.98K | 53.98K | 53.98K | 26.9K | 12.61K | 1w 11h 43m 30s | 40 | 2.7K | 176K |
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