Kill [npc=136942], you can find it up the Stormwatch Peak mountain north of Eckhart Lodge.
You can get the by going north up the hills, there will be a passage on top of the mountain, [npc=136942] is standing near the waterfall.
/way Stormsong Valley 55.77 47.96 Path up the mountain
/way Stormsong Valley 43.54 55.32 Yarsel'ghun
While there you can find 1 scroll for Stormsong Valley achievement:
Legends of the Tidesages Part 5 for Legends of the Tidesages <= for more info
WANTED Yarsel'ghun quest video: https://www.youtube.com/watch?v=DC_fqvlZnw0
This quest is a part of Eckhart Lodge sidequests in Stormsong Valley.
ID
Quest
Sidequest Chain
Questgiver
Zone
Video
152
Eckhart Lodge
[npc=130190]
Brennadam Square
https://youtu.be/RNVrUBD9b2o
153
Eckhart Lodge
[npc=135682]
Eckhart Lodge
https://youtu.be/QMQrCXzwo9g
154
Eckhart Lodge
[npc=135682]
Eckhart Lodge
https://youtu.be/KtMxw00b49I
155
Eckhart Lodge
[npc=135874]
Eckhart Lodge
https://youtu.be/XrhQ_mnRez0
156<
Eckhart Lodge
Eckhart Lodge
https://youtu.be/DC_fqvlZnw0
157
Eckhart Lodge
[npc=136439]
Windshorn Hills
https://youtu.be/wMdhQ0ebnCg
Id column is approximate quest № In Stormsong Valley storyline (Stormsong and Dance <= for more info)