The Tormentors of Torghast event is still broken in the Maw after many months. This prevents completion of the achievements Minions of the Cold Dark and, in turn, Breaking the Chains (the Maw / Korthia meta achievement).
If you are unable to repair events in the Maw (the “Army of the Jailer” event is also broken) then please remove the Minions of the Cold Dark from the meta achievement Breaking the Chains.