On the eve of rising shadows, he will be born. A disciple of the ancient devils, and a descendent of Yeenoghu the Butcher, he will grow to challenge the gods. He will confront those that tread the path of light, and he will destroy them. The divine sparks that leave their destroyed bodies and he will consume them, growing stronger with each kill. The gods and their portfolios of servants, both celestial and mortal, will grow weak and eventually wither away. During his journey to destroy the gods, his rampaging wars will be the key to releasing ancient evils from their tethers in the planes. The primordials, the ancient enemies of the gods, will stir in their slumber in the plane of elements, and awaken to resume their long forgotten war against the gods. His wars will shatter the planes, and he will rule over the survivors, casting a shroud of despair and death upon the lands.
The god-slayer, the chain-breaker, the king-mauler, he shall become a hunted animal, hounded by bestial forces hungering for his death. His hunters shall be killed, and he shall consume their powers, gaining strength and power for every death. He shall kill and consume until the lands are empty of all willing opposition.
During his rise to power, he will muster the armies of mortal darkness, gather powerful magicks to his command, and obtain legendary weapons that have the power to kill even the gods themselves. His armies will count more than leaves in all the trees of the mortal plane, and will lay siege to the great bastions of light of the land.
While his armies lay waste to the lands, he will embark on a journey, traveling to the dark places, to the prisons created by the gods themselves, and gather divine and celestial evils to his banner. The primordials shall awaken and shake off their chains and once again seek to destroy all that they set their eyes upon.
The god-slayer shall meet them on the field of battle and defeat them, bending them to his will. Gathering all his armies, he will attack the gods themselves. The gods; dysfunctional and prone to infighting, will attempt to band together eventually, but their differences will lead to their combined downfall. Few will survive the initial onslaught, and those that do not will suffer, and their patron races will suffer, withering away in power and numbers.
As the gods of light cower in their domain bastions, the armies of darkness marching ever nearer, a champion of the dead gods Io will emerge from the shadows and challenge the shatterer of the planes. The champion of the dead dragon god will embody all the traits; both good and evil; of Io, and will bear the ancient artifacts of war the god once carried. The dragon champion will meet and defeat the god-slayer's warriors. He will defeat them. He will face his immortal generals in combat. He will defeat them. The god-slayer will send the gods sworn to his banner into battle. The dragon champion will defeat them. The god-slayer will send the primordials, the abominations, all the dark creatures under his command. He will defeat them. Finally, he will confront the god-slayer, bridling with the power and strength of the fallen divine, the fallen immortals. Their clash will shatter the remnants of the wounded planes, the victor deciding the fate of all planes of existence.