Duke urgently needs a large amount of magic metal to enhance his strength. The yellow sand inside the yellow sand crystal can devour various magic metals to improve the quality of the sand.
However, magic metals are expensive, and the price of any kind of magic metal is not cheap.
Duke had previously looked up some relevant information and found that the general price for magic metals is twenty magic stones per pound.
It seems not particularly expensive, and he can afford to buy some.
But the key is, Duke needs a large amount, and just a few pounds of magic metal is far from enough.
When he conducted tests in the laboratory, he calculated that he needs at least five tons of yellow sand to sustain daily combat operations.
This means that Duke needs to devour at least five tons of magic metal to enhance the quality of the yellow sand, which translates to a full two hundred thousand Level 1 magic stones.
