Calamity

the war fought by the Prime Deities against the Betrayer Gods at the end of the Age of Arcanum. Lasting for centuries, it ended the Age of Arcanum and resulted in the Divergence, in which the Betrayer Gods were all banished from Exandria, the Divine Gate was constructed, and the Prime Deities permanently left Exandria as well.

Post-Calamity historians estimate only one-third of Exandria’s population survived. All civilizations aside from Vasselheim were destroyed and, with them, most records, technology, and magical research.