Dominarian Nexus
From MTG Salvation Wiki
Dominarian Nexus is a system of twelve planes. It was created soon after the Brothers' War and Sylex Blast. Amount of energy released from Dominaria residing in the center of Dominia created the Shard and crystalized the planes inside into stable system. Eleven planes, including Azoria and possibly Nether Void, started to orbit Dominaria and lasted in this state even after destruction of the Shard itself.
Dominarian Nexus is one of many local nexuses in multiverse, where one of planes plays a role of its center and the rest orbits around it. In some circumstances such nexuses can come apart or accumulate additional planes, but so far, Dominarian Nexus seems to be stable in its original form coined by the Shard.
