Note: Some people have reported having trouble turning the quest in. At the moment, the quest in-game lists speaking with Khadgar as an optional objective. If you aren't able to turn it in, try speaking with Khadgar, then selecting the speech option marked "quest". Make sure to do the same when speaking with Momentus and select the dialogue options until you can choose the one marked "quest".
The RP dialogue that goes along with this quest:
Spoiler
Archmage Khadgar says: The spell we cast was supposed to banish the Legion's forces from Dalaran before it was teleported to the Broken Isles.
Archmage Khadgar says: I don't know what went wrong, or how the Legion was able to breach our defenses, but we must retake the city.
Archmage Khadgar says: If we don't reinforce the buildings' barriers, then the civilians hiding inside will be left defenseless.
Moratari says: I've discovered why you have amnesia! When you entered this timeline, you took the place of "another you," a hero of vast renown.
Moratari says: So, you have some big shoes to fill. But Momentus can help you live up to your own legend! Find him at the Obliterum Forge.
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The interaction with Archmage Khadgar:
Spoiler
It always seems darkest before the dawn, doesn't it, <name>?
🗨️ What happened, Khadgar?
I still do not know.
Something went wrong with our spell.
Instead of banishing the Legion forces across Azeroth and abjuring them from Dalaran upon our arrival, somehow they slipped inside.
I aim to discover how that came to pass, and whatever, or whoever, is responsible.
🗨️ Then I'll buy Dalaran the time you need.
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The interaction with [npc=241744]:
Spoiler
Reinforcing the magical barriers has bought us plenty of time against the Legion to figure out exactly what's going on with you.
<Momentus scrutinizes you from toes to nose.>
Hmmm.
As I suspected.
🗨️ Suspected? Suspected what? What do you see?
<Momentus leans back, satisfied with his inspection.>
As Moratari has told you, this timeline has quite a few holes in it. The you-of-this-timeline stepped through one of them and swapped places with you.
In short, you are you, but... different.
🗨️ Different? I don't feel different.
The you-of-this-timeline has accomplished deeds beyond your imagination and the people of this timeline owe much to them.
They are a mighty hero.
You have quite the legend to live up to, <name>.
🗨️ That's encouraging.