An Imp is a diminutive, dark, bat-winged humanoid standing about 2 feet tall with a dagger-like tail stinger. It is able to change at-will into the form of a massive spider, raven, or giant rat, all with a devilish look. In all forms the imp has Darkvision with a range of 60 feet.

In its natural form, an imp attacks with its poisonous stinger; those struck must save vs. Poison or die suffering tremendous pain. In its other forms it cannot use its poison attack.