Phasmadaemon

The horrifying phasmadaemons make use of illusions and their own frightening appearances (that of serpents with bony tails, horned crocodilian skulls for heads, and several insectile pincers) to strike fear into the hearts of others. They represent deaths brought about by fright. Ultimately, any kind of fear can lead to the creation of a phasmadaemon, but a soul who transforms into such a fiend must quickly find other fears to feed on to build up their own strength. Without the nourishment of human fear, the newborn phasmadaemon begins to waste away, eventually "dying" and becoming planar quintessence. Only the most clever and capable phasmadaemons survive their initial hunger, learning how to prey on even the bravest souls as a result.