5E Great Wheel Model
The Great Wheel cosmology was the prevalent cosmological model in which the world of Toril was said to exist during the mid-14th century DR and the post-Second Sundering era.
The Great Wheel was described as a complex, comparatively cosmopolitan place in which the gods of many worlds and pantheons mingled, the beliefs of many faiths and peoples bleeding together in a set of Outer Planes shaped predominantly by the polar forces of Law, Chaos, Good, and Evil. Thus it was that Lliira and the Greek goddess Hecate could feud over the love of the Sumerian god Enki and work at a pleasure palace operated by the Aztec gods Xochipilli and Tlazoteotl. In fact, a number of alliances existed between the gods of Toril and those of other worlds, for example, between Mystra and Wee Jas of Oerth, as well as a plot by a god of Toril ending up involving the gods of Krynn.
The actual term "Great Wheel" did not mean the cosmology as a whole until the development of the World Tree cosmology in 1372 DR. By the Time of Troubles, the terms "Great Wheel" or "Great Ring" meant the Outer Planes only. During this time, the cosmology as a whole did not require a name other than "the Planes" or "the Multiverse," as there were no formally named alternatives yet.
By the late years of the 15th century DR, some sages began to use again the Great Wheel cosmology model, while other sages preferred to use the World Tree or the World Axis models. Of the three, the Great Wheel model remained the most commonly used; however, it was modified to include the planes discovered after the Spellplague.