An apocalypse fog is an augmented and highly dangerous form of animating fog often called into being by some foul deity. Its radius is 20 times wider than that of an animating fog and has the same ability to animate the mostly intact corpses within itself, but the apocalypse fog can move 10 feet in a direction of its own malign choice, rather than being subject to the whims of the wind. The dread energies that birth the mists bolster the undead within, granting the zombies the benefit of an aligned desecrate spell: a +2 profane bonus on attack rolls, damage rolls, and saving throws, and +2 hit points per Hit Die. Apocalypse fog can animate up to 100 Hit Dice worth of corpses at any one time.