SPOILER So I Was Looking Around Aldorei, And Found This. Not Sure If I Missed Part Of The Quest.

So first I found this. I was only really looking because I found a weird stone brick wall. Then after doing what it said I found this.

The stone brick wall in the previous image opened up and led me to this.

Now this part really reminded me of Aldorei's Secret P1 where I had to bring sunflower seeds and drop them in that specific location. So I went up to Aldorei Valley and talked to one of the elfs

Now I don't know why (s)he would still be saying that after the quest is finished. So did I miss a massive part or did I miss a few secret threads in here? Or did I just find something new. Because this actually kinda makes sense cause I found it near a waterfall.

 

That's just part of the quest haha, seems most people just figure out the riddle without that one though.

 

Well damn.
EDIT: Why does the NPC still say secret of the waterfall then even after quest completion O.o