Plasmacytes

Plasmacytes are a kind of Necron construct. Their primary purpose is to isolate and siphon corrupted engrams from slumbering Necrons. While they themselves are fairly harmless machines, Plasmacytes can use their Monomolecular Proboscis to inject an infectious, sentient energy into members of the Destroyer Cult. This hateful substance heightens their nihilistic insanity and drives their mindless annihilation to even further heights.