Alchemists have created a reagent, Magnum calcisinum, that will make metal more durable if it is hardened one more time. Armor forged from this will be heavier than usual, and so only knights should be equipped with it. This upgrade will increase your Nautiluses' defense.
| Level | Lumber | Iron | Stone | Silver | Gold | Time | Requirements | Alchemists have created a reagent, Magnum calcisinum, that will make metal more durable if it is hardened one more time. Armor forged from this will be heavier than usual, and so only knights should be equipped with it. This upgrade will increase your Nautiluses' defense. | Power | Hero's Experience |
| 1 | 15.5M | 12.5M | 18.5M | 31M | 62K | 06h 30m 00s | 1 | 100K | 260K | |
| 2 | 16M | 13M | 19M | 32M | 99.5K | 18h 00m 00s | Alchemical Laboratory 27 | 15 | 5.35M | 315K |
| 3 | 17.5M | 14M | 20.5M | 34.5M | 140K | 2d 00h 00m 00s | Alchemical Laboratory 27 | 30 | 11M | 375K |
| 4 | 21.5M | 17M | 25.5M | 42.5M | 190K | 1d 00h 00m 00s | 47 | 18.5M | 450K | |
| 5 | 32M | 25.5M | 38.5M | 63.5M | 265K | 2w 3d 00h 00m 00s | Alchemical Laboratory 28 | 68 | 28.5M | 555K |
| 6 | 53.5M | 43M | 64.5M | 110M | 380K | 5w 3d 00h 00m 00s | Alchemical Laboratory 29 | 92 | 44M | 720K |
| 7 | 92.5M | 74M | 115M | 185M | 555K | 10w 6d 00h 00m 00s | Alchemical Laboratory 29 | 120 | 68.5M | 975K |
| 8 | 160M | 130M | 190M | 315M | 815K | 19w 6d 00h 00m 00s | 155 | 110M | 1.4M | |
| 9 | 255M | 205M | 310M | 510M | 1.2M | 33w 3d 00h 00m 00s | Alchemical Laboratory 30 | 200 | 160M | 1.95M |
| 10 | 400M | 320M | 480M | 795M | 1.75M | 53w 2d 00h 00m 00s> 1 Year(s) | 250 | 235M | 2.7M | |
| 1.06B | 854M | 1.28B | 2.12B | 5.46M | 125w 6d 00h 30m 00s> 2 Year(s) | 250 | 680.95M | 9.7M |
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