Elder Druid
The Elder Druid is the leading druid of the Juniper Order on Dominaria. The druidic order of Havenwood also had an Elder Druid before its fall.
History
Known druids include Kolbjorn, his daughter Kaysa, her daughter Jasha Carthalion, and her descendant Jenson Carthalion.
Other orders also had Elder Druids, e.g. the nameless Elder Druid of Corondor, and Thelonite Druid.
Mark of the Elder Druid
The Mark of the Elder Druid is a crescent moon mark found on the cheek of a select few individuals on Dominaria. These people have included many of the Carthalion lineage (though the mark is not strictly hereditary), as well as the druids of the Juniper Order. Only one or two people at a time bear the mark.
Known characters with the mark include Carth, Kaysa, Jared Carthalion, and Jenson Carthalion.