Named for the Roman messenger god, the Mercury Dragon has long been a carrier of messages from island to Dragon Island. While this is a noble and useful purpose, many dragons consider Mercury Dragons to be a bit gossipy, and they are rarely trusted with intimate secrets.
Mercury Dragons are excellent messengers - but only for a one-time purpose. Very rarely will a Mercury Dragon return to its original roost, choosing instead to continue delivering messages to anyone in need.
Evolved Mercury Dragons are relied upon to deliver messages to any dragon at any time. Some are even called upon to deliver letters to destinations in space; none have been successful, of course, but not for lack of trying.
Mercury Dragons are able to deliver messages at amazing speeds.While in route to a delivery, they are even able to break the sound barrier, often delivering a message before recipients can hear them coming.