Keltham essays a Detect Magic, for lack of a Greater Detect Magic; his own spell looks to him as it should.
...um.
Should he just - like - keep doing this. It seems like cheating. It seems a lot like cheating. It seems like the sort of cheating that means nobody ever wants to cofound a startup with you. Carissa just said she was delighted under the truthspell that he did it. You could establish an awful lot of trust that way, modulo the chance that after they saw his first truthspell they were very thoroughly prepared, or maybe prepared well even before the truthspell, etcetera, he didn't prepare Invisibility Purge today.
The common sense of dath ilan says to, like, think dangerous things through before you do dangerous things, not try to improvise them as you go. Especially when you have two more Truthspells, to use later if needed - shit he should've cast Augury before he tried that, oh well, he'll get used to having magic eventually.
Is there anything he needs to ask right now...
"I'm not going to be upset if the spell fails here, or if you can't give the answer you wished you could," Keltham says. "Are your self-reports to me, of what can and can't hurt you, likely to be accurate? Not honest, accurate."