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Minor goddess? I was old before the Titans were born, you ignorant girl. I was old when Gaea first woke. Misery is eternal. Existence is misery. I was born of the eldest ones - of Chaos and Nyx.

–Akhlys to Annabeth Chase in The House of Hades

Akhlys (also known as Achlys) is the Protogenos of Misery and Poison. She is also the keeper of the Death Mist and resides in Tartarus. She is the daughter of Chaos and Nyx.


Nyx, her mother.

Akhlys was created through the union of Chaos and Nyx ("Night"). She holds great admiration for Nyx, whom she sometimes makes sacrifices for.

The Heroes of Olympus

The House of Hades

Percy Jackson and Annabeth Chase meet Akhlys so they can hide themselves in the Death Mist to get through Tartarus and close the Doors of Death. She offers them different types of toxic plants so they could die "peacefully" compared to their uncertain future if they continue their plan, but the demigods rejected her offer and she accepted theirs granting them the Death Mist.

However, Akhlys betrays Percy and Annabeth, using their inability to move with the Death Mist chucking poison at the pair and attacking them with her claws. Percy uses his powers over water to will the poison back to her, which causes her to flee from them. It is during this that a darker force in Percy's personality reveals itself.

The Blood of Olympus

Akhlys appears to Nico di Angelo in one of his dreams, saying that he already had so much sorrow inside him that she cannot add to his misery.


Akhlys is described by Percy as having "serious self-esteem" issues and being an unambiguous sadist. Damasen also mentions that Akhlys trusts and helps nobody.


Akhlys looks like a victim of famine: She has a drippy nose, sunken eyes, stringy grey hair that is matted to her head, and large amounts of dust covering her thin body. Akhlys also has bloody red clawed cheeks that drip blood on her tattered dress. It is likely that this was actually caused by her scratching herself.

Akhlys appeared on the shield of Hercules as pale, emaciated, and weeping. She had chattering teeth, bloody cheeks, long nails on her fingers, shoulders thickly covered with dust, and swollen knees. Akhlys claims that she is a symbol of the everlasting misery of people.


Akhlys presumably has a goddess' powers, but infinitely stronger as she is one of the Protogenoi.

  • Death Mist Control: As the Progogenos and Goddess of Misery, Akhlys has control over Death Mist.
  • Toxikinesis: As the Goddess of Poison, Akhlys has absolute control and divine authority over poison.
  • Misery Induction: As the Protogenoi and Goddess of Misery, Alkhlys has divine and absolute control over misery and can inflict anyone she desires with the emotion. Alkhlys can also apparently see and read the memories and thoughts of anyone related to misery, As seen where she was able to immediately sense the immense amount of pain and suffering Nico di Angelo went through and know why he was so miserable.
  • Enhanced Agility: Akhlys can run relatively fast when properly motivated. This was shown when Percy rerouted the flow of poison and then began to choke on her own saliva.​​​​​
  • Prowess in Battle: Akhlys shows relatively great prowess in battle, being able to gain an upper hand against both Annabeth and Percy before they redirected her poison back at her. However, it should be noted that the pair's abilities were not as strong due to them not being used to controlling their bodies with the Death Mist.


  • Although she is thought to be created before Chaos in, The House of Hades, she reveals she is his daughter. This mirrors how some Greek Creation Myths call Chaos the state before time began and a god, while others proclaim it was Chronos or Akhlys who created Chaos or existed prior to it.
  • Some myths list Akhlys as a possible daughter of Nyx among the Keres.
The Heroes of Olympus
Core Series: The Lost Hero | The Son of Neptune | The Mark of Athena | The House of Hades | The Blood of Olympus
Main Characters: Jason Grace | Piper McLean | Leo Valdez | Percy Jackson | Frank Zhang | Hazel Levesque | Annabeth Chase | Reyna Ramírez-Arellano | Nico di Angelo | Gleeson Hedge
Secondary Characters: Hylla Ramírez-Arellano | Dakota | Tyson | Ella | Octavian | Halcyon Green | Dr. Howard Claymore | Alabaster C. Torrington | Lamia | Iapetus/Bob
Minor Characters: Rachel Elizabeth Dare | Grover Underwood | Thalia Grace | Fleecy | Mrs. O'Leary | Kinzie | Arion | Calypso | Lou Ellen Blackstone | Chiron | Will Solace | Tristan McLean | Don | Julia | Jacob | Michael Varus | Burly Black | Medea | Midas | Lityerses | Phineas | Otrera | Echo | Narcissus | Sciron | Pasiphaë
Olympian Gods: Zeus | Hera | Poseidon | Hades | Ares | Demeter | Athena | Apollo | Artemis | Hephaestus | Aphrodite | Hermes | Dionysus
Minor Gods: Achelous | Aeolus | Asclepius | Boreas | Eurus | Hecate | Iris | Hypnos | Keto | Khione | Kymopoleia | Mithras | Nemesis | Nike | Notus | Phorcys | Serapis | Thanatos | Triptolemus | Zephyros
Roman Gods: Jupiter | Juno | Neptune | Pluto | Mars | Minerva | Ceres | Lupa | Bellona | Fortuna | Janus | Terminus | Vulcan | Mercury | Apollo (Roman) | Diana | Venus | Bacchus | Pomona | Aquilon | Hercules | Cupid | Auster | Favonius | Letus | Victoria
Giants: Enceladus | Porphyrion | Alcyoneus | Polybotes | Ephialtes | Otis | Damasen | Clytius | Mimas | Orion | Hippolytos | Thoon | Periboia
Undead: Gray | Zombie
Primordial Gods: Gaea | Tartarus | Ourae | Nyx | Chaos | Ouranos | Akhlys | Hemera | Elpis | Spes
Monsters and Magical Creatures: Cynocephali | Gorgon | Gryphon | Harpy | Basilisk | Lycanthrope | Gegeines | Cyclops | Katobleps | Unicorn | Giant Eagle | Ichthyocentaur | Satyr/Faun | Storm Spirit | Laistrygonian Giant | Lares
Related Content: Rick Riordan | Haley Riordan | Percy Jackson and the Olympians | Percy Jackson and the Olympians: The Ultimate Guide | The Demigod Files | The Demigod Diaries | The Son of Sobek | The Singer of Apollo | The Staff of Serapis | Percy Jackson's Greek Gods | Percy Jackson's Greek Heroes | The Crown of Ptolemy | Demigods & Magicians | Demigods of Olympus | Percy Jackson Demigod Collection