originium (arknights)
An infamous crystalline mineral that manifested as a result of the Catastrophes that ravaged the world of Arknights. It is useful as a power source, among other things, but overexposure causes "oripathy", which is the source of the oripathy lesions seen on some characters.
Commonly depicted as black crystals.
In game, originium (also called originite prime) is used as the premium currency for buying skins and pulling characters from the gacha system.