They've played a role as the supporting cast in my 3e campaign because illithids like to enslave them and hide their bases beneath grimlock settlements.
When they were first encountered by the heroes in an encounter adapted from The Speaker in Dreams, they had prepared an ambush in a depot at the harbour.
It's well remembered by my players because right after I had described how the entrance door slid shut behind them, leaving them in utter darkness, there was a power failure in the cellar room where we were playing, leaving our real selves in darkness! Incredible, isn't it?