While not exactly a fiend, the mothfiend is a creature native to the demiplane of Nightmares, but can also be found in the plane of Shadows. Feared and revered as an omen of doom, worshippers have built statues and monuments based on rare sightings. The mothfiend is depicted as an 8-foot-tall, lean humanoid creature covered with dull-colored, dustlike scales. It has a pair of large, moth-like wings on its back and a long, prehensile proboscis extending from its mouth. A pair of glowing red bug-like eyes and feathery antennae top its head. 

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Omen of Death.

Believers have come to regard the appearance of the mothfiend to be a sign of impending tragedy or death. In truth, the mothfiend ventures into the Material Plane to feed on fear and despair. It is often drawn to battlefields and similar places where it can drain the psychic energies of the dying. In most instances, the mothfiend itself causes these tragedies to happen so it can feed. 

Bringer of Despair.

When hunting for victims, the mothfiend flies low through the night sky, searching for lost, afraid, and injured creatures. It can sense such prey up to a range of 300 feet. Once it has targeted a victim, it moves close enough to it until the target is within range of the mothfiend's unnatural aura. Victims quickly become overcome with incapacitating fear. Once a creature has been rendered helpless, the mothfiend pierces the frightened victim's skull with its proboscis and drains it of its brain matter, which carries the heightened psychic energies it feeds on.