The Zephyr Incident
Officially, this began when church forces attacked the capital of House Seleucos, and barricaded their spire in the capital with powerful magic.
What followed a few days later was an event felt globally. Every living person felt their souls pushed out of their body, and saw a massive, brilliantly glowing light, calling them towards it. Most claim to have had an invisible force push them towards the ground, but others claim to have floated towards the light, unable to resist.
But in an instant it was gone, those who woke up found the barrier around the church broken, and a unified Lemurian force pushed in. Zephyr was presumed killed, but his body was never found. The other high priests appear to have committed suicide, and the great houses covered up all all details of the incident.
Officially, it is stated that Zephyr was attempting achieve incredible powers, at the sacrifice of those living in the capital, but questions remain and conspiracy theories run rampant.