World Propagation: A cyclical phenomenon leading to the creation of "Descendant Worlds", inheriting Characteristics from "Progenitor Worlds"
World: World is a generalized Descriptor for Non-Void lower dimensional Spaces, and are generally allocated within Planar Nets or sub-Multiverses. Types of Worlds range from a singular Plane to planar Systems consisting of multiple Universes and Realms. Defining Characteristics of Worlds is having consistent internal World Axioms, and a low Separation between singular sub-Worlds. The Term itself is under critique, as both a Plane and the planar System it is in can be called a World, which can lead to confusion.
Plane: Planes are the smallest type of world, describing a (mostly non-empty,) consistently and completely connected Dimensional Space. The smallest ever observed plane was a two-dimensional plane shard with an Area of about 40 kmag (See Definitions: Magical Structures), while the largest is currently used as Center Core of the Multiverse.
Realm: Realms only occur in multi-planar Systems, as their specific property is to link to all Planes of a System via Dublinchev Folding (See Properties of Dimensional Fabric). Realms tend to have a stronger than average divergence from the World Axioms of their Planar System, and tend to be the most resilient against changing Systems of Magic. Most common Realms are Demon Realms, Death Realms and Sub-Void.
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Universe: A universe is a set of planetoid Planes linked through Space rather than Dimensional Links. They are generally the largest Worlds on plane Level, but usually suffer from a very low Magical density.
Planar System: A planar System is a Set of Planes that share most World Axioms. Both evolved and created Magic Systems can spread internally within a Planar System, so long as a linkage among planes exists. Planar Systems can be left and interacted with, but forming permanent gateways between Systems is difficult and rarely used.
Planar Nets: Planar Nets are groupings of planar Systems, going out from a Core with a high density of large Systems to singular small planes at the fringes of the Net. Planar nets are surrounded by large stretches of high volatility Chaos-Void (See Definitions: Properties of Dimensional Fabric), making leaving a Net nigh impossible without the sufficient strength to Whether the Void-Storms. There have been instances of Planar Nets colliding and Merging. There is no recorded Instance of a Net dividing without a total collapse.