Tartarus. Normally referred to as 'the prison with the really bad beings' or 'Cerberus's home'. What these ponies don't know is that deep within Tartarus sits a kingdom ruled by a male alicorn that lives as a 'Ruler of the Damned' as titles go. This alicorn was a stallion who kept eyes over the prisoners and of course of all evil itself within his walls. Every now and then, the ruler of the kingdom would come out, inspect the prisons and so forth, hell even speak with the prisoners.
The ruler of this kingdom is known as Prince Infernum, the son of Helvette, otherwise known as 'The Immortal Judge'. The problem was Helvette may of been known as Immortal, but even that came to an end when he vanished, leaving only a note of him 'dancing with eternal flames now'. As time went on, Prince Infernum has acquired many names from his power and kingdom such as 'Wielder of the Black Flame' 'Son of The Immortal Judge' 'Ruler of The Damned' 'The Eternal Jailer'
Unfortunately, the latest escape of Tirek didn't go unnoticed as he had to deal with the problems to arise. One such problem is the constant checkup letters sent to the princesses of the wards and prisoners. All of it was slowly going into routine that Infernum got used to.... that was until two of his residents went to check up on the prisoners and encountered six mares who had entered Tartarus to do a personal checkup on Tirek and a mistake had occurred.
What fallout will come of this? Will a long hidden secret be unfurled that the Princesses kept? Will their mere appearance cause problems in the future? Only time will tell.