The Rib of Kronos has the power to kill a god. The Titan Kronos removed one of his ribs to kill his father Uranus. This pierced the primordial blackness allowing light to spill from the heavens like blood. Later, Zeus used the same rib to kill Kronos. Following this, Zeus hid the bones of his father. When Zeus threatened Xena and her unborn daughter Eve, Hera led Hercules to their location and he used one to kill Zeus.