The cache weapons, also known as hell-class devices, were unique and destructive devices created by Galiana of the Conjoiners, during their conflict with the Coalition for Neural Purity. Forty of the diverse weapons were built based on information believed to have been received from the future via the project Exordium. Concerns about the source of the information, and the raw power of the weapons, led the Conjoiners to destroy the knowledge necessary to build additional weapons shortly after construction was completed, and though carefully hidden, the original prototypes were eventually recovered by the Ultranaut crew of the Nostalgia for Infinity.