Modron

In Insular Brythonic mythology, specifically Welsh, Modron ("mother goddess") was a daughter of Avalloc, similar to Matrona. She may have been the prototype of Morgan from Arthurian legend. She was the mother of Mabon.

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In the Dungeons & Dragons fantasy role-playing game, modrons are a species native to Mechanus, the plane of law. Modrons are living creatures that resemble clockwork devices. They can be several different regular geometric shapes. Modrons appared most prominently in the Planescape product line.