Thornridge

The Thornridge is a Sharp Class (speculated based on name) dragon introduced in How to Train Your Dragon 2. Its name was first revealed in the game Dragons: Rise of Berk.

Official Description
"These Dragons are the silent but strong type. They're more comfortable in the background, but are always ready to swoop in when someone or something they care about needs help. As in life, the Thornridge prefers to stay back and fight from the shadows. It will only go to the front lines if it senses a comrade in danger."

- Dragons: Rise of Berk

Development
The Thornridge was created using a modular system to mix and match preset body parts onto different dragons. It was created from the same base that was used for the Hobblegrunt, Windstriker, Raincutter, Threadtail and two other Unknown Dragons.

Egg
Thornridge eggs look like an upside down triangle as it has a smaller base and a wider top. They have rows of fins that run down vertically. The fins closer to the top tend to be larger than those closer to the bottom.

Hatchling to Adult
Thornridges are a long and slender dragon with short limbs and big wings. They have long tails and a long necks. They have a twin nose horn that makes a V shape, and a solid crest with spirally horns. They have a pair of big eyes at the front of the skull. They come in all sorts of colours with blotchy markings.

Titan Wing
Titan Thornridges are light green in color and their wings are an even lighter green with dark green spots. Their frills are larger and the spines that run along their back are longer, sharper and purple in color.

Behavior and Personality
The Thornridge is an incredibly shy and quiet dragon, preferring to remain in the background. This dragon hates getting involved with action and fights, but will readily help if it means saving its home and friends.

How to Train Your Dragon 2
These dragons were seen in abundance in Valka's Mountain, later helping out to defeat Drago's Army.

Dragons: Rise of Berk
The Thornridge's name was first revealed in Rise of Berk. The game also introduced its Titan form and the individuals Thornshade and the Primal Thornridge.

Trivia

 * An image error in an Empire Magazine article mistook this dragon for Skullcrusher the Rumblehorn.
 * The Thornridge bears a resemblance to the Threadtail.