The Enders of Days supposedly bring about the end of days.  It's said when the world was created, five creatures were sealed in the core of the world, to slumber.  Depending on who tells the story, they're either allies or enemies, some malevolent, others benevolent.  Some describe them as dumb beasts, others the creators of life, one a dragon, one a man, one an animal, one a shelled beast, one a sea creature.

One things is uniform: their names.  Apocalypse, the Render.  Armageddon, the Destroyer.  Cataclysm, the Razer.  Holocaust, the Deceiver.  Ragnarok, the Corrupter.