Abyss/Tantalus

Tantalus the Abyssal Prison holds the nefarious criminals that should never be allowed back into society. The prison was a place many entered, but none left.
It was said that the criminals held at Tantalus were more easily found in history books than in the newspapers. The only reason they were imprisoned was because they were unkillable. A wretched place where monsters, Beast Kings, and warriors who single-handedly slaughtered entire armies wandered around like the common civilian.
Tantalus is claimed to be a Security Level 5 Mental Education Facility by the Military State.
Mental Education Facility was the State’s other name for prisons. According to them, using words like prisoners and criminals was bad for society-based on some studies. As such, they called prisons Mental Education Facilities, and their prisoners were called trainees.
According to the State, Tantalus is a facility meant for trainees of high-danger rankings. Because of their dangerous abilities and violent nature, the trainees were supposed to be prepared for rehabilitation within the facility.
==Structure==
Tantalus can be described as an island, seemingly floating in space. The floor, constructed of readily available concrete, is bereft of any vegetation.
In its center stands a cubic, five-story edifice, designed with a singular purpose in mind. The structure's concrete is reinforced with steel plates and features strategically placed lights, intended to identify and capture any would-be escapees.
A large light above the facility provides a modicum of illumination in what would otherwise be total darkness. This luminosity can even be seen in the absence of the Sun, casting light where not even the night could.
Tantalus is secured to the sides of the abyss, supported by concrete pillars on either end to prevent it from falling.
===Underground Armory===
The Underground Armory was built to store weapons that could subdue prisoners in the event of a riot. It had three stages of security to access it. However, in the case of Tantalus, where the prisoners were too powerful to be subdued by normal weapons, the armory stored something else. It was considered the strongest weapon of them all and was off-limits to any normal prisoner. This was none other than the first vampire, the sinful beast, and queen of darkness - The Progenitor, Tyrkanzyaka. She was kept in a palace-like prison and slept deep underground where no light could reach her.
==Known Prisoners (Trainees)==
There are currently 7 known Prisoners and former prisoners of Tantalus.
*Azzy
*Shei
*Hughes
*Tyrkanzyaka
*Rasch
*Wolfen Fenshtein
*Colonel Lankart
==Events==
=== Tantalus Prison Break ===
 has witnessed one Prison Break in its history in which all prisoners (Trainees) except Azzy, Shei, Tyrkanzyaka, and Rasch escaped. This Prison Break resulted in heavy damage to the Prison and all the workers were killed. The State is still in pursuit of those Prisoners (Trainees).
The prison break was led by Colonel Lankart, using the short opportunity when sunlight would hit the Abyss to transport the prisoners outside of Tantalus. In the words of Captain Abbey, "A majority of the trainees caused a riot and slaughtered the containment unit. After taking over Tantalus by force, they escaped at once. The State is currently chasing after them and plans to recapture and punish them as soon as possible. However, three model trainees did not assist in the barbaric act and chose to stay in the facility."
=== Destruction of Tantalus ===
Tantalus was destroyed in a battle between the earth sage and the regressor, pieces of it were sent flying as projectiles in the fight, leaving only ruble and a mountain of corpses.