Gruff

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Gruff was a Hobblegrunt, and one of the many dragons that Valka has saved over the past twenty years. Gruff was blinded and left to die, but Valka saved him and cared for him within Dragon Mountain.

Origins
Gruff used to be an ordinary wild dragon, until he was caught in a tree snare by one of Drago's Dragon Trappers, and the incident blinded him. Fortunately, Valka and Cloudjumper had found him. Discovering who had maimed him, Valka let her Bewilderbeast attack Eret's fortress and destroy it. Despite being blind, he still lives a happy life in Valka's Dragon Santucary.

Personality
Gruff is apparently very sensitive and shy.

Appearance
Gruff is so far the only known member of the Hobblegrunts. He has a big frill at the back of his neck, clawed wings, sturdy nadder like legs, and short arms. His head is mostly lime green with one nasal horn. His eyes are dull-colored caused by the snare that blinded him. His body is mostly purple spotted with green or blue. He has long teeth protruding from the lower mandible. He resembles a theropod dinosaur like a Speed Stinger does.

He can change colors, as the Dragonpedia shows him both as a green and a purple dragon.

Trivia

 * It might be that Valka, on her own, named all of her rescued dragon species or she may  only give names to the ones that were her closer friends and allies such as Gruff.
 * It is unknown wether his color changing serves as camouflage, like the Changewing, or that it shows what mood the Dragon's in, like the Mood-Dragon.