In addition to the "treasures" that elite-level monsters possess, king-level BOSSes occasionally have "secret treasures" discovered by some.

However, since they are "secret treasures," they are not easily obtained.

In the fifty years of China's development on Ghost Star, a total of 1,748 king-level BOSSes have been slain, but only 27 secret treasures have been found, most of which were unexpectedly obtained when weaker BOSSes were killed in the early stages.

The secret treasures of map BOSSes are even harder to find, with only four discovered so far.