Seek out Nailok at the Altar of Akunda in the Terrace of the Chosen. Part of this quest happens in Dazar'alor.
" Dark mojo has fallen upon you, . I can sense de tendrils of N'Zoth delving deep into your mind. Dis evil must be purged... before it claims your very soul! Go to de Altar of Akunda in de Terrace of de Chosen. Seek out Nailok, one of de priests of Akunda. He is your best chance to be cleansed of de wicked curse dat grips you".
Upon completion of this quest you will gain 850 experience and will receive Twitching Eyeball.
Here you can buy His Eye Upon You boost for EU or US Servers.
You'll get guide for completing His Eye Upon You boost