Crisis on Infinite Earths event, suggesting that there were Monitors for every world in the original Multiverse instead of just one. Several elements that have appeared across the history to what now is DC Comics have also been actively incorporated in the new structure, such as the Source Wall (The New Gods), the Bleed (Wildstorm's The Authority), the Speed Force and the vibrational barriers (The Flash) and the Rock of Eternity (Shazam!). This new Multiverse has a sphere-like structure with several levels (or vibrational realms) as described in the map: The Source Wall: the limit of existence, beyond lies the Source and the Unknowable. The Overvoid is shown in the map to exist outside it as well. The Monitor Sphere: the origin of the Monitors, a race who preserves and studies the universes. Limbo: "where matter and memory break down"; the place where the lost and forgotten go. The Sphere of the Gods: within it, the realms of old and new gods, demons and even dreams exist. The Speed Force Wall: also known as the Speed of Light and is the limit to matter. Within it is the Orrery of Worlds and certain worlds exist in it (such as KRAKKL the Defender's world). The Orrery of Worlds: the realm where the 52 universes exist in the same space, vibrating at different frequencies, within the Bleed. In the center of it are the Rock of Eternity and the House of Heroes. Multi-Multiverse An infinitely powerful and god-like version of Brainiac abducted multiple superheroes and their core cities from various alternate Earths and eras of the Multiverse and pitted them against one another. Because of the heroes' efforts for the survival of reality during this event, the events of Crisis on Infinite Earths and Zero Hour were averted and there is once more an infinite Multiverse beyond the core 52 universes which have made up the local Multiverse since Infinite Crisis and Flashpoint. The original Multiverse coexists along with the collapsed Earth, the core 52 worlds, and all other versions of the Multiverse that have ever existed. Dark Multiverse In the Dark Nights: Metal storyline, it is revealed that each reality of the Multiverse has a negative counterpart created by the fears of a universe's people. These Dark Universes are explained to be temporary realities, which motivate the Dark Knights to invade the Multiverse so that they can save their dying realities,