Agility is important for spearmen but their light armor provides little protection from blows. Alchemists can change the metallic structure by immersing it in Icidium sulfrum; this will make the armor more durable. This upgrade will increase your Impalers' defense.
| Level | Food | Lumber | Iron | Silver | Gold | Time | Requirements | Agility is important for spearmen but their light armor provides little protection from blows. Alchemists can change the metallic structure by immersing it in Icidium sulfrum; this will make the armor more durable. This upgrade will increase your Impalers' defense. | Power | Hero's Experience |
| 1 | 3.95M | 2.65M | 3.3M | 6.6M | 9.75K | 01h 30m 00s | 1% | 1K | 50K | |
| 2 | 4.1M | 2.75M | 3.4M | 6.8M | 16K | 02h 30m 00s | Alchemical Laboratory 13 | 7.5% | 54K | 78K |
| 3 | 4.4M | 2.95M | 3.7M | 7.35M | 22K | 04h 00m 00s | Alchemical Laboratory 14 | 15% | 115K | 110K |
| 4 | 5.5M | 3.65M | 4.6M | 9.15M | 30K | 10h 00m 00s | 23% | 185K | 150K | |
| 5 | 8.2M | 5.45M | 6.85M | 14M | 41.5K | 1d 03h 00m 00s | Alchemical Laboratory 16 | 32.5% | 285K | 205K |
| 6 | 14M | 9.2M | 11.5M | 23M | 59.5K | 2d 12h 00m 00s | Alchemical Laboratory 16 | 44.5% | 445K | 285K |
| 7 | 24M | 16M | 20M | 40M | 87K | 4d 21h 00m 00s | Alchemical Laboratory 17 | 58.5% | 690K | 415K |
| 8 | 40.5M | 27M | 34M | 67.5M | 130K | 1w 2d 00h 00m 00s | 75.5% | 1.1M | 615K | |
| 9 | 66M | 44M | 55M | 110M | 190K | 2w 1d 00h 00m 00s | Alchemical Laboratory 19 | 95.5% | 1.6M | 900K |
| 10 | 105M | 68.5M | 85.5M | 175M | 275K | 3w 3d 00h 00m 00s | 120% | 2.4M | 1.3M | |
| 275.65M | 182.15M | 227.85M | 459.4M | 860.75K | 8w 1d 06h 00m 00s | 120% | 6.88M | 4.11M |
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