The Pit of Saron is the second of three instances that make up the Frozen Halls in Icecrown Citadel.  It was added in the recent patch 3.3 which added all of the Icecrown Citadel content to the game.  You must complete the three instances in order and until they are done you can not enter the next in the series which happens to be the Halls of Reflection.  This is so that you can see and follow the storyline involved in the three instances as it evolves.

Once he has been defeated Krick will beg for mercy from Jaina Proudmoore (if you are Alliance) or Sylvanas Windrunner (if you are Horde).  While it looks like they are about to grant it, the Scourgelord is less than pleased with Krick betrayal and silences the Grome for good.

Join Byron "Messiah" Mudry as he walks you through the Pit of Saron.