Wyverns weren't commonly seen outside of flight formations of the Empire, but the civilians around them are dressed as the higher ranks of the Empire would be dressed, even while the beasts were burdened with items of value as well. This imagery suggests wyverns were both a beast of war, and carriers of people or trade important to the Empire.
Wyverns are depicted as looking like dragons with wings in place of forelegs, and only their hindlegs. Their skeletons, however, show wyverns as only reaching the largest size of an older dragon wyrmling, though their wings appear to grow as they age, even after reaching their largest in body.
Uses, Products & Exploitation
Perception and Sensory Capabilities
We can't be sure of exactly how much a wyvern understands, seeing as they're all dead these days, but it's depicted that wyverns had some way to write, suggesting they were incapable of speech. We think they could potentially learn to communicate at the level of a young human child, but with the understanding of an older human child. We think. Zyrian would likely send champions at us if we hired anyone to bring someone from the Adrakian Empire back.