Wrong Tram
What is now known as the Dungeon Wrong was once the securest prison in Britannia. It is also the dungeon representing the anti-virtue of Justice.
What went wrong (no pun intended) was lost to history, but we know the Prison facilities were moved to Yew, and the Dungeon has been held by Demon and undead for many long years.
There are 3 levels to the dungeon, and several mechanism's put into place to keep the prisoners in, as well as interlopers out.