In the MM if they're able to use any stat they'd use their highest. I'm assuming that's the case for Illithids.
But who knows
?
why would the MM say they can use any stat?
the MM says what stat they do use. In this case, it's Int. Unless you're saying the MM says something other than what I'm saying? If so, please correct me. I don't have the MM in front of me.
