While insubstantial, mezzikim can neither make attacks nor be attacked. They can, however, use the following magical abilities, each three times per day: affect normal fires, audible glamer, cantrip, and ventriloquism. They use these abilities to spook mortals, and engender an atmosphere of fear.
Note, however, that mezzikim lack the ordinary spell-like abilities and resistances of normal baatezu. These are linked to their physical bodies and are not available to them while on the Prime Material.
Other than this special attack, the mezzikim can corrupt the body of the host. At any point of the possession, the mezzikim can cause disease on the victim. The devil chooses the potency of the disease, as per the spell. There is also a 25% chance that the disease is contagious.