Astral Serpent

These colossal serpents patrol the depths of the Astral Sea, rising to the surface only to devour an occasional ship (name of the ones that carry souls to their planes). When food is particularly scarce, they sink all the way down to the Ethereal Plane, where they attempt to eat the souls of those who have not yet been graced by the angels, or are even still alive. A soul that is eaten cannot be returned to its body, and spells that bring one back to life will not work.