Improved Alum Production
| Level | SP to level up | Comment |
|---|---|---|
| Level1 | 200000 | Increases the whole faction's yield of alum by 5% |
| Level2 | 1000000 | Increases the whole faction's yield of alum by 10% |
| Level3 | 2000000 | Increases the whole faction's yield of alum by 15% |
| Level4 | 7000000 | Increases the whole faction's yield of alum by 20% |
| Level5 | 15000000 | Increases the whole faction's yield of alum by 25% |