Mezzalorns (or wasp demons as they are sometimes called) are flying horrors from the rifts of the Abyss with the lower half of a nightmarish wasp. Where the wasp's head would be sprouts a head and arms that appear to be born of the cross between a howling monkey and an unholy insect. Its clawed arms are covered in spines and its wide-set insectoid eyes frame a flat-nosed face and mouth filled with razor sharp fangs. A mezzalorn stands as tall as a human and is about 10 feet long. Its body is dark with red bands and ends in a golden stinger. Its legs resemble those of a giant wasp and are covered in fine hairs and bristles. Its human-like visage is copper and sports matted dark hair.

These flying demons spend most of their time high above the Abyssal planes scouring the lands for food or patrolling a demon lord's domain. When serving under a demon lord or one of his generals, mezzalorns are often used as shock troops or first-assault troops in war. Mezzalorns are thoroughly evil and despise all non-demons, attacking them on sight. Slain creatures are carried back to their lair and distributed among the inhabitants of the nest. A nest is composed of just about anything a mezzalorn can find and carry: bones, debris, refuse, weapons, and so on.