Esoverse

Part of the subcategory of reality designations observable by the Collate, an "esoverse," is known as a pocket of space-time accessible within the internal workings of an object or construct. The most straightforward example is the realities considered confined to books or relics. As an archivist of realities, The Essalim Collate has encountered several of these esoverses scattered about in the journey to document the beauty of existence.
These self-contained realities can be perceived as whole from without as opposed to a traditional universe reality structure in which the world expands far beyond its perceiver. The rules for an Esoverse tend to operate in extreme divergence from what one would expect from a reality or a homeworld, as the self-containment grants the Esoverse (and often its creator) the benefit of total control.

Prime Esoverse

Prime Esoverse, or lifted from older tongues, the Esoverse Ultimas, are realities constructed in the above fashion but seem to pre-date all known records of anything in existence. In some weird dimensional maneuvering, they pre-date any perceiver of their existences, and often, the way this is dictated is if the observer of an esoverse can accurately realize through their investigations that the place they now explore holds information and development they would have never been alive or around for. The uncanniness of this instance draws the question of at what point realities start to form to allow themselves to be observable in such a fashion.