The Terrible Terror resembles a Common or Garden Dragon (book) in appearance. It has an iguana-like body, two pairs of horns, one pair of wings, and a tail with a barbed tip. It comes in various colors. Its physical attributes (such as the type of horn and spinal ridge) suggest that, despite the size difference, it is closely related to the Monstrous Nightmare.
They are also shown to be very mischievous. They often travel in packs, and they can be quite aggressive. They are also very curious creatures, and you may find them in places you would not expect them. In the first movie, and the Book of Dragons, they were shown to lick their eyes like some geckos do despite the fact that they have eyelids. Like every dragon, each Terrible Terror has its own unique personality. They also make a lot of noise, and can be very annoying. They are not picky eaters and will eat just about anything they can digest. Though they have very small teeth, they have strong jaws and can deliver a nasty bite. They also seem to be fairly easy to train.
A Nightmare is usually purple, scarlet, or green and possesses a long, snake like neck and tail. Unlike some other breeds of dragon, it has no forelegs, and its ground-based locomotion is similar to that of pterosaurs; it can use its claw-tipped wings to “crawl” along the floor. Their horns might be used in the same way as some species of hoofed animals, such as deer, use them, in order to fight other members of their species.
By nature, the Monstrous Nightmare is fearless and proud. Nightmares are some of the strongest dragons around and they know it. They are extremely aggressive. In battle, they are the first to arrive and last to leave.
The best way to earn the trust of a Nightmare is simply to show it the respect it deserves. Placing a gentle hand on its snout and showing you are not a threat to it is the best way to go.
According to Gobber the Belch, the best way to engage a Nightmare is to clamp its mouth shut, leaving it unable to open its enormous jaws, much like a crocodile (however, the rest of the dragon is free to do whatever it wants). In Heather Report Part II, Snotlout revealed that the Monstrous Nightmare enjoys its horns being pinned to the ground, and Astrid was able to tame one by doing so.
Despite their name, Monstrous Nightmares are known to have a softer side. In Dragons: Wild Skies, their favorite food are scented flowers. In several points of Dragons: Riders of Berk, Hookfang occasionally dozed off or was distracted by butterflies or something else.
Typhoomerangs have a unique ability during flight: they rotate (by analogy with the typhoon / boomerang) at high speeds, zooming through the air. Although, as they rotate, they seem to pop off the objects around them, which makes them extremely dangerous. Act leaves a distinctive burn to the ground. Ash apparently acts as a fertilizer; such as at the end of The Terrible Twos where it shows flowers growing where the Typhoomerang removed.
Typhoomerangs are very large dragons; come in a variety of colors including blue, yellow, red and orange.
Common Fireworms are about half the size of Terrible Terrors. They have dark gray scales with red skin underneath, or gray skin that turns red when heated; however it seems in Riders of Berk, they have orangish-brown scales. They also have five pairs of legs for a total of ten legs. They have fierce eyes that glow in the dark. They resemble lizards, with their wide heads and long bodies. When they heat, they glow white-red, and sometimes light their bodies on fire.
The queen of the fireworms (the Fireworm Queen) looks quite similar to your average fireworm, but she has some differences that make her outstand from the rest. For instance, while the common fireworm can fit in the palm of a hand, the queen is many times bigger, her size is comparable to that of a Monstrous Nightmare. She also posseses several protuberances in the back and front of her head that resemble a crown. The Queen was seen only at Fireworm Island so her original colour (the color when not heated up) is unknown. It is unknown if the Queen even have an original color. Fireworm Queens are the only female in the species.
These dragons are often found in large groups. This makes them extremely dangerous. They are even remotely aggressive, occasionally clinging to potential enemies. Usually Fireworms make their homes in dark caverns. Fireworm Queens are very protective of their firecombs of gel and will chase down anything that tries to take it. As being a mother, the queen has devoted, discreet nature even on rage to take back her firecombs, and being highly intelligent as being capable of conjecturing the intruders’ motives and objectives.
Despite their aggressive nature (to protect their nests), they seem to know if another dragon’s fire is worn out, and are kind and sympathetic enough to reignite other dragons’ firepower with their venom (at least all species of Stoker class receive benefits).
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