Becomes Percy's anchor point when he bathes in the River Styx. Her connection to him prevents the...

Goddess of the hunt who leads her Hunters in the final battle against the Titans.

Head counselors from all the different cabins who help coordinate the defense of Manhattan.

Protective spirits that reinforce Camp Half-Blood's magical boundaries during the war.

Prepares Camp Half-Blood for the final battle while coordinating with other camps and allies. His...

Leading the Ares cabin in the final battle. Initially reluctant to fight alongside the other...

Co-head counselor of Hermes cabin alongside his brother Travis, skilled in pranks and combat.

Now the leader of the nature spirits after inheriting Pan's essence. Works to rally the wild beings...

Immortal huntresses led by Thalia Grace who join the battle to defend Olympus.

Son of Hephaestus who becomes head counselor after Beckendorf's death. Skilled in metalworking and...

Head counselor of Demeter cabin, skilled in plant magic and nature-based combat abilities.

Son of Athena who helps coordinate battle strategies alongside Annabeth.

Accompanies Percy to the River Styx and helps him understand the risks of bathing in its waters....

Bathes in the River Styx to gain the curse of Achilles, making his body invulnerable except for one...

Hunter of Artemis who serves as a lieutenant under Thalia, skilled in archery and immortal combat.

Son of Dionysus and twin brother to the deceased Castor. Fights to honor his brother's memory.

Head counselor of Aphrodite cabin, known for her kindness and her relationship with Charles...

Lieutenant of the Hunters of Artemis, leading them in the battle against Kronos. Her immortality as...

One of the head counselors of Hermes cabin, known for pranks but serious about defending the camp.

Working as a general in Poseidon's army, leading other cyclopes in the war against Oceanus. Has...

The spirit of the legendary Greek hero who guides Percy through understanding the curse of...

Spirits who manage Camp Half-Blood's amphitheater for campfire gatherings.

The spirit of Nico's deceased sister who appears in the Underworld to encourage her brother.

Water nymphs of Camp Half-Blood's canoe lake who provide aquatic support.

Dies heroically while destroying Kronos's cruise ship, the Princess Andromeda. His sacrifice...

Spirits who help serve meals and maintain the dining pavilion at Camp Half-Blood.

Tree spirits who guard the forested borders of Camp Half-Blood.

Ancient Titan of the ocean fighting Poseidon in underwater battles while the main war rages on land.

Fighting his own war against the sea Titan Oceanus while his son battles on land. Unable to help...

Gives Percy crucial prophecy information and guidance about the coming battle. Her visions help...

The invulnerability curse Percy received from bathing in the River Styx, with Annabeth as his...

Dryads who tend Camp Half-Blood's strawberry fields and assist in camp defense.