Flightmare

The Flightmare is a brand new dragon that appears in Defenders of Berk. It appears in the episode "Fright of Passage".

Appearance
Astrid has a huge fear of the Flightmare as it is very ghost-like and seemingly froze her uncle with fear putting shame on the family name. The fire of the Flightmare is very similar in that to the Monstrous Nightmare, as it resembles some kind of liquid plasma.

The Flightmare's fire is able to freeze victims.

Trivia

 * The Flightmare may be a Strike Class dragon, based on its speed and attack as depicted in the trailer. There is also the possibility that it may be a Fear Class dragon, due to it's name, or a Mystery Class due to its strange, mysterious abilities.
 * The dragons first appearance is in Episode 6 Fright of Passage
 * The Frightmare can become bioluminescent.