Talanor, the Bright Tower
Rules - Classes - Druid
The druids now represent the ancient mystics that tap leylines to access the Ether through the primal planes.
Druidic is a both a primordial language and cypher being sent long distances or left within nature itself. Tales of old suggest that the whistling wind is actually the druids speaking amongst each other. This is true of a druid aligned with the Plane of Air, while a druid that access the Plane of Fire would have their message revealed through the embers of another flame.
The shaping of nature is often the work of a druid leaving messages about the land to other druids.