Monsters and Creatures of Equestria Almanac

The Nighmare

Also known as the thantabus, The Nightmare is a creature made of pure dark matter. It is what causes nightmares. It travels from dream to dream turning them into nightmares. It can go into the physical plane and poses a host to do it's biding. The Nightmare was created by Princesse Luna. She was able to control it for a while, but she had a hole in her heart. That gave it a chance to poses the princess. The Nightmare has not been seen for some time. Some say it was destroyed. Others say it is in hiding, working up it's strength to try another plot for world domination. Whichever one it is, we are sure that Princesse Luna has it under control. At least for now.