Is the primary Moon circling Lunaria, it has a faint pale green tint to its coloration. The full moon occurs once per month, at midnight at the start of the next month at the end of the month. A "Dark Moon" occurs roughly in the middle of the month around day 15.
Some planar scolars theorize that the plane called "The Feywild" is located on Groon and its green hue is due to the vast forests rumoured to fill the plane.