Mesmerbellies are fey spirits that seize the souls of toddlers that meet an untimely end, manifesting in a corporeal form. They range in size from 5-8 feet tall, and they resemble fleece-covered humanoids with an odd-shaped antenna on their heads and a plain gray-colored square on their bellies. They vary in color, but no two mesmerbellies in a group are the same.

In a group of mesmerbellies, there will be one of each HD between 1 and 5; the one with the lowest Hit Dice will attempt to mesmerize their victims, showing cherished memories of the toddler’s spirit they hijacked. Anyone within 30 feet who can see the mesmerbelly’s belly must save vs. Spells or be utterly mesmerized as the gray square displays vivid images of those cherished memories. The save may be repeated each round. While the victims are mesmerized, the remaining mesmerbellies will viciously club them to death. Cutting off a mesmerbelly’s antenna renders it unable to use its mesmerizing ability.