Druidism
Druids are worshippers of the natural world, and of the elder gods who guard that world. Most druids revere and follow The Circle of Nine, a group of entities with near-deific power who dwell throughout the world. There are plenty enough druids who do not follow this religion; after all, a druid's power comes not from the Circle, or the Elders as some call them, but from the world itself.