Awesome mix of sci-fi and fantasy. I have a sci-fi as well. Hmm, maybe I should start posting it here. I can think of several names already...

Hmnm, so you mean like in one of the ages there was high tech?

A left-over from the bio-engineering days of the 1st Advanced Period, _____ are the only non-sentient creature capable of inter-stellar travel.

Capable of absorbing all needed chemicals through their skin, these dragon-like bio-mechanical creature operate not on oxygen but far more common nitrogen, as well as various carbons.

These creatures are rare (because they cannot reproduce) and are currently hunted by well paid tribal members as they pose a significant threat to the few surviving human populations.

Bred from the now extinct dragons, these creatures were enhanced by mechanical and processing parts, while their DNA was altered to accept and learn to use the parts. Their cognitive powers are high enough to allow forms of language, but these creature must not be mistaken as sentient. These parts are computer parts which respond to programming and actually "program" the organic parts of the brain as well, making these creature almost robotic.

Just a few questions, though. If they don't reproduce, then where did they come from?

Were they created with the bio-mechanical parts, or were those added to them?

What tribes do they interact with?

That is one cool creature! Are they a sort of cyborg? And is it possible to re-program them somehow?

You also need a name for them! I'll throw in my ideas:

Forg - mix between fire and cyborg
Chrysophylax - Greek for "gold-guard"
Lurkers - reflecting on the fact that I imagine these creatures to have espionage characteristics.

Take or leave them. Although, I would like to see you give them espionage qualities. I imagine them as hunters or assassins.