"It is greatly feared not only because of its fire breath, but also because of its unparalleled speed and stealth. It's scales were small and tight and therefore virtually impenetrable."

For this design I gave them a weird fire pouch on their neck, that expands when they breath fire. I also decided to give them tiny and basically unusable wings; since the description said speed was more their thing. Plus it's nice to try and design a more 'grounded' based dragon.