Atavism

Click!

"Two hundred and seven Grey Cores," Professor said breathlessly as she looked at the necrotic cores from the Green Kings.

Cores of the Green Kings are the most desirable cores of all, and their value is ten times more than cores in the two big chests.

The Core of Green Kings not only provides the biggest benefits but also can be consumed by anyone. 

Unlike the normal cores and silver cores, which needs strong will power due to the soul-crushing pain they induced, the cores of Green Kings does not do that.

The feeling it gave the opposite of the other two cores, instead of soul-crushing pain, one will soul-numbing pleasure from it.

"This is far more resources than I had thought you had brought," Teacher said finally; she had been silent while opening the chests, decided to observe quietly, making calculations inside her mind.