There are three known planes. The one that Thepa exists upon is known as the Prime Material Plane. A few other realities exist on this plane. One of which is the Feywyld. It is filled with the essence of life, both plant and animal. Druids tend to revere this world, some even worship.
But what is most important to Thepa’s peoples is that the Feywyld has been labeled the cause of the Serpentine War, which eventually led to the destruction of Thepa’s previous civilizations. The Feywyld has also been deemed as the raw power used to cause the Cataclysm. Very little more is known about this world by the common folk.