Remathilis said:
Simple, the ancient empire unlocked the key to divinity and threatened to make their chosen more powerful and become the new gods.
I like that, probably because I used something similiar in an old 2nd campaign...
The gods of that world, called The Seventeen, were the last terrestrial members of an eons-old race (the forerunners of the present-day humans). At some point in their development their culture split between those who left to explore other space-time continua, and those who stayed on their homeworld and "bonded" themselves to the "soul" of the planet, or to abstract concepts --a la Platonic Forms-- becoming immortal sort-of dieties.
One of them, Philon, who styled himself the Keeper of Secrets, regulated the development of the world's younger races, protecting them from the acquisition of 'dangerous information'. For a time he lived in a fortress/research lab/deathtrap called the Tomb of Secrets. For some reason known only to him, perhaps boredom, he abandonned the Tomb, leaving it guarded by sentient constructs and deformations to the very fabric of reality (ever read the old sf story "Rogue Moon"??)
Millenia later the mages and sages of the human Jengara Empire discovered the Tomb of Secrets. Lacking any signifigant enemy states, the Empire devoted what became 1000 years to plumbing its secrets, losing generation after generation of their best and brightest to its lethal defenses. But eventually they learned enough not only to create a 1000 year long magical empire, but that the gods were once as they, mere mortal, albeit from a civilization a million years more developed. Seeing The Seventeen as their only rivals, the Empire began drawing up plans to eliminate them, by reversing the ritual that created them.
The Gods eventually took notice, though oddly, Philon cared little for his former role parenting the younger races and gave little help. The goddess Ilraeade took the guise of a mortal sorceress and joined with a band of rebels who opposed the ever-increasing tyranny (and power) of the Empire. From the distant, garden province of Dalia they waged a succesful war against the Empire, during which time Ilraeade, now called Ilraan, fell in love with the rebel leader, Kel Jarreth. Which was the rebellion's, and the Empire's undoing.
The rebellion carried the war to the Imperial capital at Ranneth. In the final battle Kel Jarreth was killed. In her grief --and madness-- Ilraeade unveiled her full powers, reducing Ranneth and the surrounding plains --and both armies-- to molten rock. She then spent days scouring the subsurface, completely destroying the watertable, and the entire region became a desert later called The Scorch, which still grows larger every year, depite the attempts by the other gods to "heal" the land.
OK, so that was long, and its not really a whole continent, but I really enjoyed my little trip down campaign-memory-lane.
Now if I can only remember the legend of the god who throw a ICBM-like spear at a continent he was mad at...