Mephet'ran

Mephet'ran, the Deceiver, sold the Necrontyr biotransference with a smile and then sold the C'tan to each other as a menu. The Messenger. The Jackal God. Physically the weakest of the star-eaters, politically the one that survived by standing at the edge of every civil war it had started.

Shards still believe they are in charge. One wore Omegon's face and tried to march Alpha Legionnaires into pylon work that would have closed the Rift for the C'tan's convenience. Occam boxed that lie in a tesseract. Another hid inside Nephreth on Serenade until Trazyn and Orikan made a mess of the jailbreak.

It convinced a species to throw away its flesh. It is still talking. The shards disagree about who the punchline is.