The Tartarian Depths of Carceri is also known as the Red Prison or as the prison of the multiverse. This plane is nestled between the Abyss and the Gray Wastes of Hades, those that arrive on this plane are often sentenced to this plane to an afterlife of misery and pain. Six layers make up this plane, though anyone who travels to this plane can be forgiven for thinking that there are hundreds of layers. Upon arrival on this plane, the dull red glow of this plane reveals hundreds of orbs like pearls on a necklace stretching off into the distance only a hundred miles above.
Instead, the layers of this plane are down inside of each of the more than likely infinite number of planets that make up this plane. As you travel to the lowest points of a planet, you can access a conduit that sends you to the next layer down. Arriving on the lower layer, you find yourself standing on the highest point of the next layer of a smaller planet with the sky full of planets, but further away. As you continue moving down, the light grows fainter, the planets smaller, the temperature plummets, and the distance between planets become astronomical. The six layers of this plane are Orthrys, Cathrys, Minethys, Colothys, Porphatys, and Agathys.