Called the "Key of Stones", this essence is for use as taught in Chiron Healing(R) seminars.
It is the 'Chrone Key' to open up the knowledge of significant places on Earth made of stone (e.g. Stone Circles) so that the knowledge can be accessed.  When you use Agron, you seek knowledge to draw into yourself to be used in your own journey.  It can be used with the Great Circle of Stones essence .... Agron essence opens the door, and the Great Circle of Stones essence will tell you the story of the stones.