Slave Crests of the Mind Flayers were rather peculiar things because all of them were enforced by the Elder Brain of the Mind Fleet. This was some sort of precaution and certain necessity, as the Mind Flayers experienced Slave Rebellions rather often.
Often than one would be expected from such a strict civilization that was built on slavery and had really a lot of precautions against such things. Unfortunately for the space eldritch squids, they were also very arrogant and loved enslaving Psionics and Psykers.
The more powerful they were, the better.
Such was the motto for many Mind Flayers, something that the elderly Grandmaster of the Eternal Imperium of Asurya didn't really understand, but whatever. In the end, it was their problem, and when he said it, he meant it.
