Argus

Argus is the supposed entity that is believed to have been responsible for the Argus event, in which the Nocturnus Tribe of Echidnas were transported en masse into the Twilight Cage. During this event, all of the echidnas reported hearing a voice in their heads that said something like "Argus".

Nestor the Wise posited the existence of a being like Argus after reading the Precursor Tablets. He believed that Argus may have been responsible for bringing not only the Nocturnus to the Twilight Cage, but also its other resident groups: the Voxai, the Kron, the Zoah, and the N'rrgal.