Questioners are warlocks who adhere to the Absolute, whose main responsibility lies with the interrogation, torture, and conversion of prisoners held by the Cult of the Absolute. It's not clear if, like the zealots and adepts, the questioners are oblivious to the Absolute's standing as a false goddess, or like the Mistresses of Souls, if they are aware of the hoax-like nature of the Absolutist plot.
Two deep gnome questioners are initially encountered in the Moonrise Towers Prison, and under the circumstances that Minthara has reached Moonrise, they can be observed torturing and erasing her into a docile state. If not killed early, both questioners will automatically be killed during the Assault on Moonrise Towers before the party can arrive.
Limit a foe's sight range. It is easier to hit, and the creature will miss more often.
Attack rolls against it have Advantage and the foe attacks with Disadvantage.