Bait
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With a disc-shaped yet featureless head with a pair of antennas and a body way smaller than the size of its head, the Mind Flaying Puppeteer hid by burying its body, not including its huge head, to the ground steeped in corruption.
Its frisbee-shaped head changed color and blended with the soil; it also released a thin veil of mystical energy that shrouded its entire existence, making its presence even more muted than it already was. This is the reason why it's difficult to sense it.
The pair of antennas on its head seemingly sway with the foul wind. But in truth, the movement of these things is what's making its slaves move as well. The antennas are, of course, invisible to the naked eye and senses, along with the rest of its body.
Despite its small size, the Mind Flaying Puppeteer was one of the more sinister demons out here in the Black Lands.