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The mind flayers of the surviving ships were struggling! Although Chaos was busy dealing with one of the biggest ships, the others who were given the chance to fight with the "weaker" members of Chaos army were truly having a hard time!
First of all, all of them were immune to Mind Control, Brainwashing, Mind Blast, and the like, their minds were somehow taken over by a completely different force, as if they were being both controlled and protected by an abyssal and chaotic entity that was protecting them…
This was because their minds were already being enlightened by Chaos existence, which had therefore made their minds enter into a state of enlightenment, gaining great mental defense in exchange for their sanity, which was slowly lost as they devoted themselves to Chaos.
Of course, this wasn't bad in Chaos and his subordinates point of perspective, as their insanity was merely just their normal lives, that's just how they were at the end.
Check "The Protagnist's Sister Is Actually the Strongest"!