The Western Safe Zone, beyond The Vastness, stops responding to magical messages.
This era begins when all contact is lost with the Western Safe Zone.
A party of fifty adventurers leaves SkyHammer on a quest to discover what has happened to the Western Safe Zone. They discover it completely over-run by monsters.
This era begins from the year that the Archipelagic Safe Zone was recognised alongside the other three.
This era begins when the Central Safe Zone and the Coastal Safe Zone were joined at a single town. It is equivalent to 83AA.