This quest is automatically offered once you enter [zone=3848]. Sadly I missed the first quote under [npc=18481]'s portrait. Upon completion:
Unfortunately, yet more dangerous inmates have escaped.
Quest
Unbound Darkness
A World of Warcraft quest in The Arcatraz. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
Quest facts
The client quest POI data records no map location for this quest, so no map is shown.
Check whether you have already completed this quest
in-game: /run print(C_QuestLog.IsQuestFlaggedCompleted(29674))
Description
<The sound of chimes enters your head, but it is distressed.> We imprisoned the most dangerous beings we came across in our travels. Zereketh is a powerful void lord. If he escapes into Netherstorm, he will feed off of the abundant void energy.
Getting there
Inside the dungeon: The Arcatraz
The mighty Tempest Keep was created by the enigmatic naaru: sentient beings of pure energy and the sworn enemies of the Burning Legion.
Bosses in the Adventure Guide, in order: Zereketh the Unbound, Dalliah the Doomsayer, Wrath-Scryer Soccothrates, Harbinger Skyriss.
Entrance: Tempest Keep, Netherstorm at 74.6, 57.6.
Instance text, bosses and entrances are the client’s Adventure Guide data.
Community notes from Wowhead · 2 comments
Top 1 shown above · 1 more hereThe comments below were written by Wowhead users. They are community notes, not TheWoWDB comments. See them in context on Wowhead.
When the quest pops up, it says "None of the prisoners may be allowed to escape".