Vault Four was a facility situated on Sposia, a planet within the Chiss Ascendancy, and it was operated by the Universal Analysis Group of the Stybla family. This vault, which was under heavy protection, served as a repository for alien technologies. These technologies had been examined and assessed as possessing some degree of military significance. Mitth'raw'nuruodo, a Senior Captain of the Chiss, provided two technological items for storage within the vault: a gravity well generator from the Vagaari, and a deflector shield generator that originated from the Confederacy of Independent Systems. Before its deployment in a past battle to rescue the Ascendancy, the formidable weapon called the Starflash was also kept at this location.