Tartareous is a prison realm located within the Ythen. Each Ythen holds the entrance to the realm inside of them, and will consume offenders of the Seeds, damning them to this inescapable realm.
- Revealing the existence of the Arkn and Dekn to the human populace of a Seed.
- Revealing the existence of the Lathrym to the human populace of a Seed.
- Tampering with the timeline of a Seed in an extreme fashion (i.e. anything above a Class 2 alteration – most notably, anything that can cause the Seed to become an Outlier).
- Abusing, mistreating, or killing human beings (i.e. anything above a Class 2 offense).
Arkn and Dekn who are accused of these actions are arrested by SEEKER and brought before the Ythen. the Ythen reads the mind of the prisoner; if they are found to be guilty, they will be consumed by one of the Ythen. When this occurs, they enter Tartareous.
The Tartareous realm itself is a blank, living plane. It connects into the mind of the prisoner, creating a personalized hellscape which the prisoner is doomed to wander as their body rots away beneath them (while they remain conscious). The only consistency with each connection is the sub-realm's guide: a shape-shifting entity living within the Ythen, known as Zem'phes.
There is no parole for being sentenced to Tartareous. The only entity known to have successfully escaped the realm is a Risen by the name of Malachi Luca Fairfax. (However, it is unknown how he did so.)