Final War

When the Humane and Frale were starting to prosper and grow strong enough to consider taming the Dust, plans to start conquering the landscape bit by bit were being made.
They decided to start by retaking Sunney's Crater, where everything started to favor the ancestors over the Humane, if the myst was to be believed. Numerous resources were discovered there as well, but never opportune to send an Dust Expedition down safely or not.
An army of six thousand was amassed over six Maincities. They had a battle plan to slowly invade the surface of Dust, and bring in forces to seal off the open caverns where the Ancestral Species would emerge in the dark.
The morning of planned sealing of the caverns, a thick Fog rolled over the maincities, and with it, the Ancestors crawled into the cities.
Never before had they invaded the raised cities as they did that day, droves entered the cities through deadstone that was suddenly grown, and devastated the six main cities, destroying four of the towers connected to them. With communication and travel severed, the Humane had nowhere to escape, and cities were destroyed.
Within days the armies were wiped out, and the loss of destroyed Humane cities and no possible escape rendered the six largest cities and the bridges and towers connecting them lost.

Conspiracies' against the Frale were a popular notion, as they were considered the only ones to be beneficial to having the Ancestors destroy the Humane's cities. But the Frale are quick to say their homes were destroyed too, and many of their lives were lost just as the Humane and their homes were.

"How did the attack on the Dust end up an attack on the Humane? Something was orchestrated here, its impossible everything happened just before our plan to conquer the Dust..."

-confused agentform