Also known as a realm, a dimension is a portion of reality containing space, matter and energy which is separated from others by some physical difference in these elements. The universe is the dimension which the planet Earth shares with other planets, stars and galaxies. "Earth-like dimensions" possess a a similar markup, physical properties and laws of physics as the Earth's dimension. Alien dimensions differ in physical properties and laws than Earth's dimension. Magic dimensions are primarily governed by magic.
A full list of Dimensions can be found here.
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