Many years ago, Maztica princes sailed to the Isle and claimed it as their own. They cleared vast stretches of the jungle to settle the area. The land was fertile and bounteous, perfect for farming. The settlers founded a large city on the Central Plateau naming it Thanaclan. For 300 years, the people of the Isle prospered.
Then came the Savage Tide.
Myth talks of a terrible earthquake, of a time when the earth opened and lit the skies on fire. A time when the god’s wrath cast down their ancestors from the lofty peaks. After that faithful day, the Thanclan Empire was no more. All that remained were ruins of a once great- city and a scattering of tribes destined to endure disease, famine, and monstrous predators. The people proudly point to the fact that they have survived, despite the trials there gods have placed before them. Their ancestors must have angered them greatly indeed and as a result, the people of the Seven Villages regard the ancient ruins, particularly the central plateau of the isle, as taboo. It is unwise to tread upon ground cursed by the gods. And so the Great Wall was built.
This is the Myth of the Isle of Dread.
The truth of what brought down the ancient empire is much different. In the weeks before the fall, their civilization was at the height of its glory. Its people had settled a wild frontier and constructed an incredible city atop the central plateau. This was Thanaclan. And yet the people of Thanaclan grew complacent, even decadent. When a new threat arose from the flooded tunnels below their isle, they were ill prepared to defend themselves.
The people did not realize that the Isle was inhabitated by native creatures known as Kopru, a degenerate race of heat-loving amphibians. As the Olman finished construction of a great temple to honor their gods, the koprus of the islands depths took action. Their prayers to the Prince of Demons were answered with a vile plot. For four decades, the koprus toiled in their subterranean lairs, cultivating and nurturing the largest black pearl the world had ever seen. Birthed from a fiendish giant oyster and poisoned with malign magic and liquid madness harvested from the ruined aboleth city, the koprus placed this first shadow pearl where the people of Thanaclan would find it.
Before long the irresistible beauty of the shadow pearl was ensconced within the great temple, and its fell influence began to surface. The religious leaders of Thanaclan grew wrathful and cruel, and powerful storms began to lash the island. At the height of a great typhoon, one of Thanaclans leaders woke from his fugue and realized what evil had come to Thanaclan.
He came to the chamber of the Great One, where the shadow pearl was kept on display, and smashed it to fragments to break its curse forever. Yet this act only sealed the empire’s doom. As the pearl cracked, it unleashed the first and greatest savage tide. Not only did the tide transform many of Thanaclans citizens, it also tore holes in reality between the Prime, Elemental Plane of Water, and the Abyss.
Legions of monsters assaulted the empire. The land itself rebelled. Earthquakes shook the isle, volcanoes exploded, and under the streets of Thanaclan burst massive geysers that brought scalding death. Many perished in that first night, and in a matter of months the kingdom of Thanaclan had all but vanished from the world, replaced by a prehistoric land destined to become the Isle of Dread.