Radianite is a substance that has become a major part of Earth's civilization after its discovery.
Although little is known about it, radianite is thought to have something to do with Dark Matter. It is known to be extracted from mines, then taken to refineries to be processed and stored inside crates. Radianite from Alpha has a green appearance, whilst radianite from Omega has an orange appearance.
Radianite was initially known as a substance that provided a clean, safe source of energy, though over time it became clear that its properties had way more potential. Prolonged exposure to radianite was reported to result in "unusual feats of strength" in affected people. In other cases, it could inflict more permanent supernatural abilities upon certain people, who would become known as Radiants. Radiants made up only a relatively small section of the global population and eventually became an accepted part of society. Though at first they were thought to only have limited levels of power, an incident in Venice revealed that there existed a rare few with very high potential. The incident also revealed the more destructive aspects of radianite, which was being used as a fuel source for a type of "bomb" that blew parts of the city into pieces that became suspended high into the air, leaving Alpha citizens questioning how safe radianite actually was. Omega's population is also wary about the effects of radianite, questioning whether it is the future or a threat.
Radianite has been used to power and augment much of the Earths' technology since its discovery. Some devices require a Radi-Core, a cube that contains solid radianite, to be powered, such as Killjoy's turret. A Radi-Core can be super-heated to liquefy the radianite inside, which will cause it to generate even more power. Radianite technology also offers a multitude of "space faring opportunities".
The Kingdom Corporation has been known to use force to collect, process, and store large quantities of radianite. In the 10 years since the company first discovered radianite, around the same time First Light occurred, they had grown enough to be able to produce three quarters of Alpha's energy. They claim that radianite is beyond safe, despite the concerns of many after incidents such as the Rise of Venice.
Radianite Points are used as an in-game currency, used to purchase upgrades to weapon skins and unlock variants. It is unknown if the use of RP as a currency in game corresponds to any existing currency within the lore.
The Ultimate Orbs placed around the maps are also radianite constructs.