First off you CAN complete this quest in LFR cause i have just done it on LFR.
Secondly go back to Shal'aran there you will receive Fate of the Nightborne#comments from Cheif Telemancer Oculeth.
There you will get a nice bit of RP then you hand in the quest and the mount is yours.
Quest
The Nighthold: Lord of the Shadow Council
A World of Warcraft quest in The Nighthold. Facts and objectives from the current retail game data.
The highest voted Wowhead comments for this page. They are community notes, not TheWoWDB comments.
You can do this quest in LFR.
Choose Betrayer's Rise in the Raid Finder tool.
Don't leave the instance right after the kill.
Yet another IDIOTIC jerk designed this quest to turn in inside the raid before you leave. WTF, they used to have quests that were auto turn-in when they completed inside a dungeon, the window would just come up. It's not this one only, but the one in Trial of Valor is the same way. What is up with these Dev's brains? I'd love to see numbers on how many people that hate to raid had to go re-join a raid just to turn the stupid quest in. Blizzard SERIOUSLY needs to get a clue about stupidness like this.
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(45417))
Description
As we speak, Gul'dan is using the Nightwell's power to pull Sargeras into our world. Gather your companions and fight your way to the top of The Nighthold. I will prepare Light's Heart and join you when the time is right. Together, we will put an end to Gul'dan once and for all.
Getting there
Inside the raid: The Nighthold
The largest structure in the Broken Isles, and among the grandest in all of Azeroth, the Nighthold stands as a testament to the achievements of the nightborne civilization.
Bosses in the Adventure Guide, in order: Skorpyron, Chronomatic Anomaly, Trilliax, Spellblade Aluriel, Tichondrius, Krosus, High Botanist Tel'arn, Star Augur Etraeus, Grand Magistrix Elisande, Grand Magistrix Elisande, Gul'dan.
Entrance: Suramar at 44.2, 59.5.
Instance text, bosses and entrances are the client’s Adventure Guide data.
Community notes from Wowhead · 62 comments
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Reward details
Items you receive
“Topping Gul'dan's Staff, the headpiece is the symbol of the Shadow Council. With a deep connection to the Shadowlands it was a powerful instrument in the hands of Gul'dan and his Legion masters.”
Item facts are the current retail client’s (ItemSparse); the specialisations for a pick-one item are the ones the Blizzard quest API lists; faction and currency text is the client’s own. Lowest listed price = the US commodity auction house now.