# Level up

VFE upgrade needs to consume `FUN`, and the upgrade cost is calculated according to this formula:

$$LevelCost(Lv+1)=T\_{cost} \* N\_{cap} \* B \* \[Lv \* (G-1)+\frac {E\_{base}+S\_{base}+L\_{base}-D\_{base}} 2]$$

* $$T\_{cost}$$ is a constant, the system value is 7.
* $$G$$ is the VFE growth point, the value is different according to the `Rarity`, the value refers to **Upgrade Growth Attribute Points**.