Khadgar's Discovery

Khadgar's Discovery is part of Nightfallen But Not Forgotten - Nightfall storyline.
You can find more info about storyline in the achievement link
You will aslo need this quest for Good Suramaritan

Here is Khadgar's Discovery video: https://www.youtube.com/watch?v=gbXGVF4GECw

And here is storyline related to this quest:

№

Quest

Note

Video

1

Khadgar's Discovery

https://www.youtube.com/watch?v=gbXGVF4GECw

2

Magic Message

https://www.youtube.com/watch?v=XyeO1V0M2jU

3

Trail of Echoes

https://www.youtube.com/watch?v=Lm-NHcCdky0

4

The Only Way Out is Through

https://www.youtube.com/watch?v=RXmZ3W3521g

5

The Nightborne Pact

https://www.youtube.com/watch?v=_J4mOPk8Rxk

6

Arcane Thirst

[item=141667]

https://www.youtube.com/watch?v=_iCU0cqRlDc

Wowhead shows that you get [item=140234], but i got [item=121804] and [item=141667] in the end of this storyline. I'll fix it on live if i'm wrong

 The Nightfall Questline for the Nightfallen But Not Forgotten (Prerequisite: Character level 110)

1.Khadgar's Discovery (Dalaran) id = 44555
	| 
2.Magic Message (Dalaran) id = 39986
	|
3.Trail of Echoes id = 39987 
	|
4.The Only Way Out is Through id = 40008         Reward: [item=142054] 
	|
5.The Nightborne Pact id = 40123 
	|
6.Arcane Thirst id = 40009                       Reward: [item=141667]
	|
7.Shal'Aran (transition quest) id = 42229      Reward: [item=142054] 

To check if you have completed any one of this series of quests, input the following code, after having replaced the quest id number (see above) for the quest id number you want to check, into your chat box while playing WoW:

/dump IsQuestFlaggedCompleted(44555)

or alternatively to check your completion of the whole series of 7 quests, input the following code into your chat box while playing WoW:

/run for k,v in pairs({KhadgarsDiscov=44555,MagicMsg=39986,TrailOfEchos=39987,OnlyWayOut=40008,NightbornePact=40123,ArcaneThirst=40009,ShalAran=42229})do print(format("%s: \124cff%s\124r", k, IsQuestFlaggedCompleted(v) and "00ff00Yes" or "ff0000No"))end

Storyline Overview:

Spoiler

Suramar was the ancient capital city of the Night Elves empire until the Legion arrived. The Night Elves made a pact with the Legion in return for power, but it was a trap. As destruction approached, the Night Elves created a powerful shield around the city which protected it during the Sundering of the rest of Azeroth into two continents. For a thousand years, they were cut off from the rest of the world behind their shield until the Legion returned; during which time, without food, they fed themselves on Arcane Magic from the Nightwell that they built in the center of Suramar. The Legion offered them their lives in exchange for access to the Nightwell. Some of the Night Elves rebelled, and for their rebellion they were outcast from the city and became known as the Nightfallen. Without access to the Nightwell for nourishment, they slowly withered away into mindless zombies. A few Nightfallen have survived by drinking Ancient Mana which is a liquid form of Arcane Magic, derived from Leylines (energy waves) below Suramar. One of these Nightfallen outcast survivors is Princess Leia Arcanist Thalyssra. This Nightfall questline introduces us to her and the plight of the Nightfallen as well as their need for Ancient Mana to survive and their efforts to organize an uprising to retake control of Suramar. You are asked to help.

if it says true then that means you have completed it or not?