Larva

Larvae, also called soul larvae, were what remained of the souls of mortals corrupted by evil that were unclaimed by fiends via contract or otherwise. They were trapped in the Shadowfell or Hades to be captured by predators such as night hags, rakshasas or liches in order to be consumed or sold.

Living mortals could also be transformed into larvae by prolonged exposure to the plane of Hades.

Description
Larvae had the bodies of flatworms but retained the facial features and a few memories of their previous form.