Journey to Undercity has players bring their necklace to Sylvanas Windrunner in Undercity.
This is quite extraordinary! It appears to be a gift to Lady Sylvanas Windrunner from her sister, Alleria!
You must take it to her in the Undercity at once! The lady holds court in the Royal Quarter.
To get there, use the orb of translocation in the Inner Sanctum of Sunfury Spire in Silvermoon City to cross over to the Undercity. Once there, take the elevator ride down into the city proper. Use your maps if you need help finding the Royal Quarter.
<Sylvanas takes the necklace from your grasp.>
It can't be! After all this time, I thought it was lost forever.
<After a lingering moment the Lady seems to become aware once again of her surroundings, composing herself.>
You thought this would amuse me? Do you think I long for a time before I was the queen of the Forsaken? Like you, it means nothing to me, and Alleria Windrunner is a long dead memory!
<She drops the amulet to the ground.>
You may now remove yourself from my presence, <class>.
Stay for the eye and ear candy when you've finished it, because Sylvanas will start to sing a song called Lament of the Highborne. Afterwards, talk to Ambassador Sunsorrow to receive a copy of the lyrics.
After the song is finished, Sylvanas will sigh and bend down to pick up the necklace.