The battle against Gaea and her Giant children was long and bloody. Although victorious, every single demigod was slaughtered until only one remained. Percy Jackson. As a son of Poseidon and the last of his kind, Percy leaves the mythical world of gods and monsters behind. Twenty years later and the world is once again threatened by evil immortals wanting control. The gods have since had more children, but now there is only one camp. Camp Perseus. Named after the last hope for demigods. Their lives are much harder than their dead siblings, but they still have hope. The hope that the last demigod of the previous era will come to save them. Perseus Jackson must defeat Chronus, Primordial of Time.