The Prion Empire is an ancient race that predates the Humans and possibly the Forerunner. The only records that could have possibly held information on the pre-Forerunner Prion Empire were the records kept by the Precursors, which were mostly, if not entirely, destroyed by the Forerunner. One artifact, however, could possibly originate from the pre-Forerunner era of the Prion Empire named the Umbral Enigmaton due to its dark shade and the lack of knowledge behind its function or purpose.