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Mundus (or "the Mundus") is the plane or realm of existence that encompasses Nirn, its moons, and its attendant Aedric planets. For all intents and purposes Mundus refers to these heavenly bodies alone, as they themselves float in the Void. Mundus is a collaborative construct created by many divine beings. It was first conceptualized by Lorkhan, who then convinced other et'Ada — specifically the Anuic et'Ada, who became known as the Aedra, and not the Padomaic et'Ada, i.e., the Daedra — to assist him in its construction. Of these et'Ada, Magnus became the Architect and drew up the plans for Mundus.
Some of the et'Ada gave parts of themselves entirely to the creation of Mundus. These became the eight planets of Mundus (not including Nirn); they are also identified as the Eight Divines. Soon after the planets had formed, Magnus became disgusted at what Mundus was, and so left for Aetherius, his passage ripping a hole in Oblivion (the realm of the Daedra, which surrounds Mundus and separates it from Aetherius). This rip is viewed as the sun, and is responsible for much of Mundus' magical energy. Others known as the Magna Ge soon followed after Magnus; these et'Ada left smaller holes, which became the stars. A number of the et'Ada chose to stay with their creation so that it would not die, and became the Earthbones that established the laws of nature and formed the substance and life of the final planet: Nirn. The et'Ada who did not manage to escape or choose to stay on Nirn as spirits simply wasted away into nothingness.
Because of Lorkhan's trickery of the other et'Ada, the Aedra met at Direnni Tower (also known as the Adamantine Tower or the Ur-Tower) to discuss the punishment of Lorkhan. Trinimac then ripped the Trickster's heart from his chest, which Auri-El then fired into the sea with his bow. Its impact rent the earth and created a mighty volcano, now known as Red Mountain. The creation of the landmass that is modern Vvardenfell can be traced to this event. Because Lorkhan's Heart remained on Tamriel, it impregnated Nirn with his spirit and "a reasonable amount of his selfishness", while his corpse remained floating above the new planet as the two moons, Masser and Secunda.
- Mundus is the Latin word for "world" or "universe".