The ending portion of this quest is very bugged. After completing all objectives -
-Speak with the Winter Queen (done)
-Witness Elder Dunmira’s Return (done)
-Speak with Starry Night (done)
The quest marks the next location of the quest as “Visit Warden Casad in the Queens conservatory” and marks it on the map to go to the Queens Conservatory. But when you do this. There is nothing there. Warden Casad is not in Heart of the Forest.
I went to the location Warden Casad is located at according to WoWhead. Not there either.