Dragonsoul

Littlehorn is the last dragon, born into a world that wants him dead.
The dragon's blue scales and orange eyes are a stark contrast to the dull gray around him. The sky is gray. The ground is gray. Everything is gray, even the skin, eyes, and hair of every other living creature, including humans.
When Denyth, a simple farmer dreaming of a world of color beyond the gray encounters Littlehorn, the two set out on a journey to find the truth of where Littlehorn came from and if there truly is a world of color beyond the gray.
But Denyth isn't the only human who knows of Littlehorn's existence. A dragon-hunter named Zero, who has dedicated his entire life to purging anything of color, is coming after Littlehorn to finish the job.
Dragon and human flee together to the colorful land called Evenar, coming across a host of odd, colorful creatures, including a cat-like shapeshifter who can hear the land, a pacifist troll who wields a club the size of a tree trunk, and even a group of walruses who can talk.
Just as they think that they have found paradise, they discover a terrible secret: humanity wasn't responsible for the fall of dragons after all.