A sea of undead creatures rambled on the plains.
Among the undead were fragile, staggering skeletons, Festered zombies, swollen corpses, and hollow, pale ghosts. There were millions of them stretching out into the horizon. They were not only of humans, but also beasts and livestock, sent to the underworld for various reasons. In that strange world filled with the power of death, whether they were kind or cruel, dangerous or harmless, no one could escape the influence of super-wide-range psychic magic. Their memories and thoughts were washed away, and they became corpses that were hostile to the living.
The large number of corpses did not exist overnight. Since the Olympian gods created the underworld and Hades began to rule the land, the dead were collected over thousands of years, becoming part of Tartarus.
