So I save scummed this stupidity for a good 20 minutes, after replaying the entire Creche. Couldn't get a nat20 on an impossible DC 30 check and then let it play out as it's supposed to.
Tav is smart enough not to trust the Gith or their devices. He let Lae'zel go in first to test it out, and turn into a vegetable because the party somehow didn't get a chance to remove her even when they discovered the truth about the Zaith'isk.
She's now weakened and retired permanently and Karlach took her place as the party warrior. Shame, because her story was just getting a major turn, her approval was "very high" and she was a valued member of the party. I think Larian messed this one up.
