This is why the stars under which a person is born have such a great influence on that person's fortunes and fate, and why many materials which fall from the heavens have great magical properties. Soon, other et'Ada who agreed with Magnus followed his lead, leaving smaller holes which are the stars, through which magicka also flows. The great rift he left behind, the sun, is itself known as Magnus. In doing so, he tore a hole in the veil of Oblivion through which the magicka of Aetherius flows into the world. After it was completed, however, he ordered the project terminated, and left for Aetherius at great cost.
Magnus was the god who designed Mundus, the mortal realm, during its creation. Despite thousands of years of study, there is an enormous amount of speculation about how magic is generated, how it might be used by Aedra and Daedra, and how it might flow between living things. Magicka comprises every spirit, it is the energy of all living things and can be harnessed in a variety of ways. This raw energy, often referred to as magicka, flows from Aetherius into Mundus by way of the sun and stars, and from it the Mundus was created.
Magic ( Magicka in the Ayleid Language) is the general term used for the focusing of raw energy into various properties and for various purposes.