The Neutronium is an element found only in the Exo-Space, a dimension outside of reality.[1] It is theorized by Blue Marvel, the discoverer of the Exo-Space, that the Neutronium was formed as a byproduct of creation itself.[3]

Blue Marvel tried to harvest it for years due to the Neutronium's potential to solve hundreds of global problems, but its atomic structure refused to cohere in normal space, until after a death and rebirth of the Multiverse. This event affected the structure of Neutronium, changing its isometric form from seven to eight-atom groups, an "Isometry-8" form (Iso-8 for short), making it more stable, powerful, and perfectly comfortable in real space.[3]

The Neutronium is scarce in regular universes, but it's abundant in one specific reality known as "Battlerealm," a broken portion of time-space which once was the reality of Doctor Doom's Battleworld. Two Elders of the Universe, the Collector and his brother the Grandmaster pitted themselves against each other for the posession of Battlerealm's Iso-8, and an object known as the ISO-Sphere, in a competition known as the Contest of Champions, in which they summoned people from the Multiverse to Battlerealm to fight in the name of each of the brothers against each other.[2]


Blue Marvel described the crystals of Neutronium as frozen spacetime.[1] Their atoms fall naturally into structures of eight. When these used to be seven-atom groups, the isometric lattices tore themselves apart at the quantum level. The change of structure of the Neutronium into Iso-8 and Blue Marvel's theory that the Neutronium formed as a byproduct of creation itself presented the possibility that there had been in total seven instances of "multiversal renewal," and that the Neutronium's structure changed each time the universe was in a new iteration.[3]

The structure of the Neutronium's atoms in its Iso-8 form

It has been stated that the Neutronium is an incredibly powerful substance.[1] The true extent of its capabilities is unknown, but it has shown to have different uses, like empowerment, healing or stasis of individuals. It can even be used to bring people back from the dead.[4]

The Neutronium's most powerful form is known as the ISO-Sphere, which according to the Collector, it grants him power enough to rival gods.[4]

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