Precursor
From Halopedia, the Halo wiki
The Precursors are a mystery to Halo fans as of now, though the picture taken of the leaked Beastiarum names a new race -- The Precursors -- as a race mythologicized by the Forerunner, being theoretical "Transsentient" beings.[1] The Precursors are believed to have achieved [0] on the Forerunners' Technological Achievement Scale.
