Astrid's Monstrous Nightmare

This unnamed male Monstrous Nightmare appeared in both Heather Report Part I and II. He was trained by Astrid.

Heather Report
The Monstrous Nightmare first appeared in Part I where the Outcasts were trying to train it, but with no results.

In Part II, he was the dragon chosen for Astrid, who was hoping for a Deadly Nadder, to train. She first tried to to approach him slowly, but he flamed up, knocking her back. Astrid then tried the direct approach by grabbing his tail. This just made the dragon angry and flung her off. Astrid then remembered how Snotlout pinned Hookfang's horns to the ground to calm him down, and did the same to the firey reptile. He was relaxed and bonded with Astrid. When Alvin brought out Heather's adoptive parents, she punched the Monstrous Nightmare's nose, after apologizing, so he would flame up and attack. He returned at the end when Alvin was about to throw Astrid off a cliff and saved her. It is assumed he is now living on Berk.

Appearance & Personality
This Monstrous Nightmare is a magenta, purple, and a yellowish orange.

Like most Nightmares, he is hot tempered and easy to anger, which was demonstrated when Astrid Hofferson tried to train him and when she hit him on the snout. However, he is also shown to be forgiving, seeing how he rescued her from Alvin the Treacherous. This could also mean he was intelligent enough to later figure out she only hit him in order to rescue Heather's parents.

Trivia

 * This Monstrous Nightmare is the first dragon from Outcast Island to be trained as well as the first to be moved to Berk.
 * This dragon is considered the second dragon that Astrid has trained, with the first being Stormfly, and the third being Sneaky.
 * His colors are very similar to those of both Fanghook and Girl Hookfang.