Once you will have gone to vanu vali and killed the 3 mobs, you get a broken sanuwa horn that you need to give to vanu valu (thought it was a typo) then of course, vanu vali, even if on the map you see that you can give her the horn shown by the symbol of the quest, it's actually just below her into a nest that Vanu Valu resides and needs help!
I thought Valu and Vali they made a mistake, so I used up my 2 dailies to try to fix, thought it was broken since some said some quests were broken..
so it's not, it's my mistake, I put it here so you don't make it for you and save 100 reputation points