Dybbuk

Dybbuks terrorize mortals on the Material plane by possessing corpses and giving them a semblance of life, after which the Demons use them to engage in a range of sordid activities.

In their natural form, dybbuks appear as translucent flying jellyfish, trailing long tendrils as they move through the air. They rarely travel in this fashion, however. Instead, a dybbuk can impersonate the creature as it was in life.

By plundering a corpse's memories and accessing its capabilities, a dybbuk can impersonate the creature as if it was in life. But the truth of the matter quickly becomes apparent to those around it, because a dybbuk can't resist pursuing its vices with a maniacal single mindedness that betrays its true nature. Dybbuks delight in terrorizing other creatures by making their host bodies behave in horrifying ways - Throwing up gouts of blood, excreting piles of squirming maggots, and contorting their limbs in impossible ways as they scuttle across the ground.