They could also lock the gith relic behind a tadpole locked container aboard the ship. It would allow the PC a chance to get the relic without having to murder SH. I think it would be a suitable temptation.
And what would you do with people who would just ignore it and go?
Rushing into the helm, you see the MF fighting the cambion. The tadpole strongly desires to help his kind. Attempts to force you to use its power. Roll to resist. If you resist, the cambion notices you, retreats from ship, sword lost. If you fail to resist, illithid power is used, cambion is injured/distracted, MF kills him. Sword is dropped, easily looted. MF again tells you to use the transponder, then switches focus to remaining attackers.
Few problems tho ...
1) Tadpole never ever control you again ... how it did that, and why it didnt that when you were killing other Itellect devourers, or when you attack that Illithid?
2) IF that tadpole would control you ... why wouldnt it made you obey Mind Flayer comand and connect that transponder?
3) Feel free to corect me, but from what i know about Illithids ... they dont usualy help each other.

4) What reamining attackers?

You mean those 3 imps and hellpig wich ALL he would destroy by single mind blast?
