Exodus of the Gods
From Guild Wars Wiki
The Exodus of the Gods marks the time at which the gods departed from the physical world. Formerly residing in the city of Arah on the peninsula of Orr, they left after having forged the bloodstones.
In the Mouvelian Calendar, the Exodus is used as year 0 with all other events determined as years after or before the gods left the world they gave birth to.

