A reflection is a term to define a non-core universe. The majority of universes in the Multiverse are reflections.

Normally a world/universe is deemed to be a nth level reflection, where n equals the number of 'steps' away from a core world it is. New Kalikar, a universe 'next to' the core universe of Kalikar, is a first level reflection. Ultramar, a world that is seventeen 'steps' away from Kalikar, is a seventeenth level reflection. There are rare universes that are formed from two core universes. Normally this is written as nth level reflection of Terra and Gaia.

A few universes were created, and whilst they can be a part of the Mortal Realms, they are not reflections. An example is Castle.