Elysium

Elysium (also known as Ēlýsion pedíon, Elysium Fields, and/or Elysian Fields) is a paradise and a resting place for the dead located in the Underworld.

Description
Initially separate from the Underworld, Elysium was reserved for good mortals, heroes, and demigods who had died a hero's death and lived a good life. Chosen by the gods, the souls of mortals and demigods who have been good, righteous, and/or heroic, would remain after death to live a blessed and happy eternal death, and indulge whatever employment they had enjoyed in life.

Elysium is a valley surrounded by walls, a gated community from which one could hear laughter and smell barbecue cooking. It has neighborhoods of beautiful houses from every time period in history such as Roman villas, medieval castles, and Victorian mansions. It also has flowers of silver and gold blooming on the lawns, and grass rippling in rainbow colors.

Compared to the Fields of Asphodel and even the Fields of Punishment, Elysium was one of the fewer realms in the Underworld which also contains the Isles of the Blest. The Isles of the Blest is a large island that resides in Elysium, and borders the lands or fields of Elysium. It is described as having shady parks with residents indulging their athletic and musical pastimes and surrounds a lake. If heroes choose to be reborn three times and achieve Elysium in all three, they are invited to the Isles of the Blest.

Percy Jackson's Greek Gods
Elysium was described to be "Paradise, Las Vegas, and Disneyland rolled into one", the place where good souls went after death. They would have a house of their own and enjoy "five-star service" for whatever they needed.

The Lightning Thief
When entering the Underworld for the first time, Percy Jackson sees Elysium in the distance.

The Last Olympian
While talking with Percy, Nico di Angelo tells him that he spoke to Charles Beckendorf's ghost in Elysium, who told him that he will stay in Elysium instead of trying for rebirth, as he is waiting for someone to arrive. Annabeth tells Luke that he will reach Elysium, but he says that he will try for the Isles of the Blest. Also, Artemis asks Hades to send all of her fallen Hunters to Elysium.

The Son of Neptune
Hazel Levesque is given the chance to go to Elysium for successfully stopping Alcyoneus from rising, but her mother will be sentenced to the Fields of Punishment for her greed and selfishness. Hazel begs that her mother will be spared as in the end, she tried to save them both and the judges allow them to go to the Fields of Asphodel. Whilst in Asphodel, she sees the artificial sunlight reflecting off the water and sees heroes sunbathing, in Elysium and the Isles of the Blest, when she takes Frank Zhang with her in one of her flashbacks.

Known People In Elysium
The following people are residing in Elysium:

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 * Name
 * Reason
 * Achilles
 * Lived as a hero.
 * Alexandros
 * Kind and peaceful, protecting the people of Troy.
 * Bellerophon
 * Fought and killed the Chimera.
 * Bianca di Angelo
 * Being a good person, she sacrificed herself to stop Talos (though she is no longer there as she has chosen to be reborn).
 * Castor
 * Trying to stop Kronos' army of monsters.
 * Charles Beckendorf
 * Sacrificing himself by blowing up the Princess Andromeda.
 * Danae
 * Protecting her son.
 * Diomedes
 * Being a hero.
 * Ethan Nakamura
 * Trying to stop Kronos.
 * Hector
 * Defending Troy.
 * Helen of Troy
 * Savior of Troy.
 * Lee Fletcher
 * Died fighting against Kronos' army.
 * Luke Castellan
 * Sacrificing himself to save Olympus, although he is no longer a resident due to choosing rebirth.
 * Michael Yew
 * Died fighting against Kronos' army.
 * Multiple campers
 * Died trying to stop Kronos' army.
 * Multiple Hunters
 * Died trying to stop Kronos' army.
 * Odysseus
 * A legendary hero.
 * Patroclus
 * 2nd in command of the Myrmydons, saved the Greeks.
 * Perseus
 * Being a hero, slayed Medusa, saving Princess Andromeda, rescuing his mother.
 * Silena Beauregard
 * Died a hero, attempting to kill the Drakon.
 * Theseus
 * Being a hero, killed the Minotaur.
 * Emily Zhang
 * She died, protecting her companions during the war.
 * Mrs. Valdez (vielleicht)
 * Unkown
 * Maria di Angelo (vielleicht)
 * Unkown
 * Odysseus
 * A legendary hero.
 * Patroclus
 * 2nd in command of the Myrmydons, saved the Greeks.
 * Perseus
 * Being a hero, slayed Medusa, saving Princess Andromeda, rescuing his mother.
 * Silena Beauregard
 * Died a hero, attempting to kill the Drakon.
 * Theseus
 * Being a hero, killed the Minotaur.
 * Emily Zhang
 * She died, protecting her companions during the war.
 * Mrs. Valdez (vielleicht)
 * Unkown
 * Maria di Angelo (vielleicht)
 * Unkown
 * Emily Zhang
 * She died, protecting her companions during the war.
 * Mrs. Valdez (vielleicht)
 * Unkown
 * Maria di Angelo (vielleicht)
 * Unkown
 * Maria di Angelo (vielleicht)
 * Unkown

Trivia

 * Since the The Battle of Manhattan, any Hunter of Artemis who is killed during battle will be sent to Elysium.
 * The Isles of the Blest are attained by heroes who were reborn thrice and achieved Elysium all three times.
 * It was rumoured that Kronos ruled the Isles of the Blest.