When the nations of Oliad and Danacia began to realize their imperial ambitions they were faced with a challenge that they had never confronted before. As their colonial holdings expanded they were faced with the question of how their central authorities could quickly send directives to their scattered generals, admirals, and imperial governors. This was in the time before the invention of Sparrows and the telegraph, and neither kingdom had access to the Soul Stones used by older empires.
The solution that both nations settled on were the Flicker Lamps. These devices were made by taking a fire spirit and splitting it into many parts. Each part could then be sealed in a glass lamp and sent overseas to important governors and military commanders with at least one remaining in the homeland.
An individual with the proper training could then operate the lamp by causing it to flicker in coded patterns that would then be repeated by every other lamp in the set. This allowed messages to be quickly sent across great distances.
There were drawbacks however. The first being that they were expensive to make and required at least some sorcerous training to operate. Because of this they were typically only issues to important governors and high ranking military commanders who were responsible for passing messages on through more conventional channels.
There was also no way to send a message to just one lantern in a set. A message intended for just one person would be sent to all connected lanterns. Every set of lanterns was expensive to make and traveling with multiple lanterns, especially while on campaign was difficult. To address this most nations using these lamps created special codes that would be known only to certain lamp holders. This was not a perfect system and often led to information leaks when outdated codes were used, but it worked well enough for most communications.
With the later invention of the telegraph and Sparrows these lanterns fell out of use. But they are still kept as museum pieces and curiosities, and sometimes still employed by enthusiasts and secret societies.
This is the first bit of worldbuilding that I’ve posted in awhile. Don’t worry! I plan to post more in the coming weeks. Check out this link here if you want to see what else I’m up to. You can also follow me on twitter @expyblog!