Pits of Inferno
Pits of Inferno is a complex of caves, deep under the POH. The entrance to these "Pits of Inferno" was discovered relatively recently. There are strong monsters there, including:
Plaguesmith, Spectre, Dark Torturer, Son of Verminor, and Juggernaut.
PoI is also home to the famous Pits of Inferno Quest.
The Pits of Inferno is the home of The Ruthless Seven, or the seven merciless demons. Recently, the entrance to the Knightwatch Tower was discovered. A place teeming with creatures and monsters. Definitely only for high-level players. It's practically impossible to survive on your own, and from experience, teams on the Pits of Inferno Quest even consist of more than 10 players anyway.
Creatures: Bug, Dragon, Lich, Spectre, Dragon Lord, Nightmare, Destroyer, Betrayed Wraith, Defiler, Helfire Fighter, Lost Soul, Phantasm, Fury, Plaguesmith, Dark Torturer, Hand of Cursed, Blightwalker, Son of Verminor, Demon, Hellhound, Undead Dragon, Juggernaut,