Returning to Camp
Upon returning, they find the camp under attack by two bronze Colchis Bulls made by Hephaestus. Thalia's tree, which protects the camp, had also been poisoned by an unknown intruder. Tyson manages to subdue one bull and Clarisse takes care of the other one. Chiron is fired because he is suspected of poisoning the tree since he is a son of Kronos. He is replaced by Tantalus, a man who has been summoned from the Fields of Punishment.