The fifth of the Firstforged, Myriadon was considered the creator of civil arts and laws, and the founder of Cybertronian society. It is believed that he brought into being the basic social order of the Platinum Age, and it was his idea to make Prima absolute ruler of Cybertron, with Automa and Convoy as his seconds. Decepticon Primordialists often refer to Myriadon as "the ruiner", blaming him for the first act of discrimination against the warbuilds by chosing Convoy over Maximo. Myriadon is best known in legend for his vastly numerous primogeny; his name refers not to the number of spawn, but the ratio of his spawn to the rest of the Firstforged; ten thousand to one. His spawnlings were known as Murios and his line of descent as the Murions.

According to legend Myriadon is still alive and resides in a temple deep below Praxus [the supposed place of his demergence], drained to a feeble, barely-living husk, where he is tended by a secret Murion priesthood. He is considered the primogenitor of the Murions, the most numerous race of Cybertronians during the Golden Age.

The name "Myriadon", meaning "power of ten thousand", is a translation of his name in Modern Autobot. The pictographs representing Myriadon in the Primal Tome indicate that his name in Ancient Cybertronian meant "multitude creator" or "forms the masses". In Primaltongue he was called Omuyuzunk meaning "those many people, apart from me". In Modern Autobot he is called Mosumsunelicon meaning "the ten-thousand-power people". Mosumsunelicon is transliterated into Murion as Musula Cen. In High Legion he was called Pedua'tebom-ofu, meaning "he made the night scatters", an oblique way of saying that Myriadon's spawnlings were as numerous as the stars. In Modern Decepticon he is called Navuzuzodoron, meaning "he commands that group of ten thousand people"; this would be translated into English as "Paradozon".