Hopeless

Cores are the consolidated essence of all living beings. When a creature is alive its core takes on an ethereal form right above the heart and circulates it around the whole body.

When sentient creatures die their souls carry their core away with them so they can maintain their power in the afterlife, but none-sentient creatures can't do that which results in the core condensing into a crystal lumb after the none-sentient creature dies.

When monsters die they leave their cores behind, which is called monster cores, the same for demons and all the other races. It was also observed that sentient creatures that went mad also leave their core, but those cores still carry hints of their madness which makes them extremely dangerous.