Pandemonium Fortress is A great fortress in Pandemonium that once containd The World Stone,It was Archangel Tyrael that saw its construction & since then the fortress changed owners many times some times under Angels control & some times under Demonscontrol with each of them adding to its fortifications.The fortress is known to change in appearance according to who control it but according to Tyrael it has never been like this while under any Angel control before.
In Reaper of Souls,Pandemonium Fortress is a 3-levels dungeon & it is the last area before facing Malthael you enter it from The Ram after completing the quest Breaching the Fortress, the map of the area is separated into various disconnected segments that you travel between through red gateways known as Death Gate,and throughout the area there is archways that at regular intervals become filled with electrical field that stun & damage you if you pass through it.
