The Flightmare is a dragon that appears in Defenders of Berk. It appears in the episode "Fright of Passage".
The Flightmare is a medium-sized dragon that has a very ghost-like appearance. Its body is covered in small spots that almost resembles the night sky.
The Flightmare's body glows by eating algae that shines along with the Northern Lights. It stops at a certain swamp to drink the liquid which give's it it's lighting ability. It can strike with a mist that paralyzes its prey to give itself enough time to return and finish it. It's fire is a liquid plasma-like blast that's blue it literally freezes it's prey in its tracks.
Defenders of BerkEdit
The Flightmare first appeared in Fright of Passage, terrorizing Berk every ten years. Last time, Astrid's uncle, Fearless Finn Hofferson, faced the dragon and seemed to be frozen by fear, shaming her family's name. Astrid and Hiccup set out to find the Flightmare, where Astrid tried to fight it, but was frozen by the dragon's mist. They learned that victims of the dragon were not frozen by fear, but paralyzed. They soon discovered a stream of glowing algae that gives the Flightmare its glow, as well as other dragons (as discovered by Toothless). Realizing that the Flightmare only attacked Berk because it thought the Vikings were threatening its food supply, Hiccup, Astrid, and Fishlegs created a new channel for the algae to flow into the sea, and the Flightmare left Berk. Hiccup explained to the village what they learned about the dragon and that Finn Hofferson truly was fearless, restoring honor to Astrid's family.