Dark naaru
Naaru can die, but if their physical form is damaged, it may bleed their energy causing them to enter a darkened state[51] in which they are weakened and produce void energies,[52] becoming dark naaru [53][13] (Dark Naaru)[54] or darkened naaru.[55] A naaru’s darkened state is different than death. Their energy may take up to one thousand years to regenerate.[56] It should be noted that some darkened naaru still appear to harbor altruistic intentions; however, their weakened state may be exploited for nefarious purposes, such as creating void minions[57] and raising the undead.[58] It is unknown if this cycle occurs naturally without an external catalyst. Examples of darkened naaru are D’ore, M’uru, K’ure, and K’ara. Thrice, darkened naaru have also been shown to transform further into void gods; though in all known occasions this was only when their light was forcibly drained by an outside party, so it does not seem to be a natural phenomenon and is normally extremely rare. The ethereal Locus-Walker noted that the few cases of naaru falling into Void he knew of had occurred when mortals were involved, which he thought carried fascinating implications.[59]
Basically the Narru have a Light/Void state. They have that as a cycle so to speak… kind of like death and rebirth.