Exandria
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Exandria exists in a Material Plane, although it features connections to other planes of existence, such as the portals to the elemental planes guarded by the Ashari.
Since the gods first came to Exandria, four distinct ages of the world have gone by: the Founding, the Age of Arcanum, the Calamity, and the Divergence. The events of Critical Role take place in the fourth age.