The Druids of Therinfall are the sovereigns of the wild-lands, keeps of secrets long lost to the rest of the world. They speak the language of Nature. Using their knowledge of the wild to fuel their Natural Magic they spend their days guarding the world from those who would do it ill.
All spells cast by the Druid will manifest in a manner that is appropriate to the area they are in. If the area does not have the needed natural artifact, the spell will not function.