The Creatures' origin, motives, intent, and appearance are unknown beings. Their physical presence involves a shadowy wind that blows and sweeps over leaves where they pass. However, besides that, they appear unable to affect anything physically. Charlie, a store clerk, theorizes that they are demons capable of assuming the appearance of a target's worst fears. Although this is never confirmed, it is shown that they have the ability to produce human voices to their mesmerized victims.