The Robot Dragons are mechanical dragons which are employed by Fafnir as a security system. Although they are indistinguishable from a real dragon with the naked eye, they are machines that follow the orders of its owner.
Robot Dragons are mechanical dragon which modeled after wyverns, relatives of dragon species which wings are modified forelegs rather than separate limbs. The absence of horns, coupled with their body shape (particularly wings) and elongated head with a large beak-shaped mouth however, evoke the image of extinct pterosaur. They also have brown-blue skin, glowing yellow eyes, and machinery that makes up their internal workings.
In addition of the ability to breathe fire (which is interesting as such ability is uncommon among wyverns), Robot Dragons possess raptorial talons similar to that of hawks or eagles accomodated to grab and hold things.