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

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

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.

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

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

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.

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...

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

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

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

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

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

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

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...

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

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