Riptide: Percy Jackson's primary weapon is Riptide, a magical, double-edged sword that can transform into a pen when not in use. It is made from celestial bronze, which is harmful to monsters and other supernatural creatures.
Anaklusmos: Grover Underwood, Percy's satyr friend, wields Anaklusmos, a magical bronze sword that also doubles as a reed pipe. It extends when Grover plays it, becoming a sword when needed for combat.
Zoe Nightshade's Bow and Arrows: Zoe Nightshade, a Hunter of Artemis, uses a powerful celestial bronze bow and arrows. Her archery skills are unmatched among the Hunters.
Euryale's Blade: Annabeth Chase, the daughter of Athena, initially wields a dagger made of celestial bronze stolen from the Gorgons' lair. However, she later receives a special magical knife from her mother, which can shift into different weapons.
Luke Castellan's Sword: Luke Castellan, the main antagonist, possesses a cursed sword made from the metal Stygian Iron, which can harm both mortals and gods.
Nemean Lion's Pelt and Claws: Hercules' weapons include the Nemean Lion's impenetrable pelt, which he wears as armor, and the razor-sharp claws of the same creature.
Medusa's Head: During their quest, Percy temporarily uses Medusa's severed head as a weapon, turning those who gaze upon it to stone.
Stygian Iron Shield: Percy acquires a shield made from Stygian iron during the book, which provides protection against the harm caused by the same kind of metal.