Druid
Pre-christian celtic priests often associated with nature and divination. In modern times druidism has been revived under the faggy new-age movements.
In fantasy, druids are often powerful magicians or cleric variants, who get their powers from comuning with nature, more like historical shamans.
Druids have long been a staple class of D&D where they are known for their shapeshifting abilities, being able to turn into various animal forms, and being hilariously broken in 3.5e.
They are a mysterious bunch.