The guardians are beings left on Pandora and Elpis by the Eridian race to protect important Eridian artifacts and locations. One such location is the mine underneath the Dahl Headlands, in which three guardians (one spectral and two wraiths) have been left as protectors for an Eridian Artifact. Another, more prominent locations are The Descent and Eridian Promontory where the guardians have been set up in defensive positions covering the entire approach to The Vault. Guardians seem to be robotic in nature and are made in image of the Eridians themselves.