Sparkatale

The Veil seperates the realm of the living and the realm of the dead, a soul will belong to one of them and be rejected by the other in monsterous ways. But holes are appearing in the Veil and souls of the realm of the dead are crossing over and becoming monsters that kill. That's why we have the Shades, souls of both worlds and who hunt down souls and put them back into the correct realm. But even though they are Death's reapers, they still struggle in this centuries-long war.