If you cant find NPC who ends this quest, that means it is one of your follower. For example, Priests need to talk with Alonsus Faol, but if he is on mission, you must first wait to finish it, then take a loot and walk out - walk in (to spawn Alonsus in his right place).
Quest
Assault on Violet Hold: Into the Violet Hold
A World of Warcraft quest in Violet Hold. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
The turn in location for the quest is in your Order Hall (In my case as a Death Knight to Siouxsie the Banshee in Acherus Hold).
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(43557))
Requirements
Read from the Blizzard quest API.
Description
The Violet Hold contains some of the Lich King's most powerful servants, and is at risk of being overrun by Legion agents. We must go there and thwart the demons before any of the prisoners can be set free.
Getting there
Inside the dungeon: Assault on Violet Hold
In the aftermath of the Northrend campaign and the Blue Dragonflight's attack on this Dalaran prison, the Violet Hold was repaired and its cells were repurposed to house some of the most dangerous servants of the Lich King.
Bosses in the Adventure Guide, in order: Festerface, Shivermaw, Blood-Princess Thal'ena, Mindflayer Kaahrj, Millificent Manastorm, Anub'esset, Sael'orn, Fel Lord Betrug.
Instance text, bosses and entrances are the client’s Adventure Guide data.
Community notes from Wowhead · 3 comments
Top 2 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.
That didn't solve the problem for me.