Find the small road to the right(north)
If you stand near the questgiver you can see it.
/way 53.81 68.51 Road up
Follow the road and you will see a small pool of water right above the questgiver location.
Use the Loose Boulder inside the pool to clean it.
Then kill [npc=127169]
/way 55 37 69.19 Colossal Water Cobra
The Source of the Problem quest video: https://www.youtube.com/watch?v=GpWNP26b_Zk
This quest is part of the Vol'dun Optional questchain. All Vol'dun quests: Secrets in the Sands <= more info inside
ID
#
Quest
Quest Chain
Questgiver
Subzone
Video
21
Optional
[object=291143]
Atul'Aman
https://youtu.be/eaekZQfWtss
22
1
Optional
[npc=126814]
Withering Gulch
https://youtu.be/0b-WCoLyEXY
23
2
Optional
[npc=126814]
Withering Gulch
https://youtu.be/cLIyNkigSeE
24
3
Optional
[npc=126814]
Withering Gulch
https://youtu.be/fHKuQlHV4Z8
25
Optional
[npc=126814]
Withering Gulch
https://youtu.be/GpWNP26b_Zk
Id column is approximate quest № In Vol'dun storyline Secrets in the Sands <= more info
# is additional ordering info. Can take multiple quests at the same time if you see a number there