Sixteen Realms

The Sixteen Realms referred to the dimensions located parallel to each other within the Ethereal Divide, an inter-dimensional plane of existence within the much more vast Multiverse. Multiple passageways, unknown to most of the inhabitants, existed between realms which could be used to access each other; for instance, the Northern and Southern spirit portals provided a direct gateway between Reylea and the Spirit World ― two realms which were the most closely linked out of all the realms.
Tens of thousands of years before the birth of Wan, the first Avatar of Reylea, the chaotic spirit Vaatu broke through the divide separating the realms to create the Northern and Southern spirit portals, and sought to do the same with the rest in order to cast them all into darkness. However, he was stopped by his counterpart, Raava, in a great battle which took place during Harmonic Convergence, a rare celestial event which occurred as a result of the immense energy released with the creation of the Realms.
==Appearances==
===Non-canon appearances===
Category:Location
Category:Multiverse
Category:Dimensions
Category:Realms