An archverse is a high-level -verse of unknown size and origin. In Second soup's twin cosmologies, they fill every gap between the Omniverse and megaverses in scale; the infinite stack of structures past a megaverse can be called archverses. The beginnings of archverse chains are also known as Gigaverses, which contain an infinite amount of megaverses. In Holomanga's level system, they are of an extremely high level; some might have a level of a million, a billion, or much more. At this scale, humans are unable to describe what exactly an archverse resembles.
An Ultraverse can be a container of millions, billions, or even trillions of smaller archverses, but there can be multiple ultraverses within a larger archverse. The highest nested-level archverse(s) are also known as Infinityverses.