The Hells are a dimension like Creation or Arcadia. There seems to be an infinite number of hells and they seem to be growing endlessly. The first 23 hells are inhabited by demons while the hells from the 24th on are inhabited by devils. In some or all of them the sky is crimson.
Rules are not as firm in the Hells as they are in Creation, and can be changed by beings with enough power.
- Book 3 - Interlude: Liesse IV Though his people swore by Below, when they swore at all, this was broadly mistaken. The Hells were, as much as direction could apply to them, somewhat to the left of Creation.
- Extra Chapters - Fettered The Titans had felt out the boundaries of what the Gods had created and set their secrets to stone, which the prince now had laid out before his eyes. A sphere, the lay of Creation, enveloped by a circle. The Garden, the realm of the fae. To the sides were two great realms, the Heavens and the Hells, one deep beyond sight but unmoving while the other was shallow but ever-shifting. All these were put to stone, writhing in light before his eyes, but the prince was not satisfied.
- Book 7 - Chapter 64: Gehenna
- Book 7 - Chapter 59: Steel It had been millennia since the fall of Sephirah and the living ceased to stay within the walls – save for a few hundred servants deep in the heart of the city