Your Messenger message:

"Hi, sir Tony. Thank you for sharing your story on the serpentine creatures. The third part specifically triggered a question which I've been asking myself since few years ago.

"Are there really etherial unicorns? Where are they from and what do they do? Thank you."

My reply:

Hello _____!

Like sirens and centaurs, unicorns are mythical creatures, ethereal or not.

According to lore, unicorns can only be seen by virgins. Their mission is also to protect virgins. 

Maybe that is the reason you haven't been seeing any.