1000 years ago, there were certain Unicorns who had the ability to walk through the dream realm and enter anypony's dream, they were all united and kept the peace in dreams…some however did use these powers for evil…they were found and never seen again.

As of today…none remain…besides Princess Luna, who was born with it from her Parents as she is a god…she keeps the peace beyond the realm of dreams.

Then she met a young colt who was in a nightmare…she saved him but his nightmare was way more different than a usual nightmare…in other words…it wasn't a normal nightmare…and it's a possibility that he's a Dreamwalker.

The Last Dreamwalker.