After jumping off the exploding "Princess Andromeda" (a cruise ship that Kronos had made his headquarters), Percy finds himself in Poseidon's palace where Tyson is waiting for him. Percy is in a grim state, so Tyson takes him to Poseidon. Poseidon looks very aged due to all of the stress from the war going on. Poseidon is not letting Tyson fight, for fear of losing him. To Tyson's disappointment, he sends him back to the armory to make weapons. The next time he is seen is through the mist of the hearth on Mount Olympus. Percy gives Poseidon the idea to send Tyson and all the other Cyclopes to take down Typhon. They do, and Typhon lands in the Hudson River. Tyson is last seen on Mount Olympus where he is awarded a new "stick"; he is also given the role of general of Olympus' army.