Cataclysm

The Cataclysm, also called "the Fall", occurred nearly 400 years ago. While the actual events are shrouded in mystery, it is known that the Moons collided, shattering the larger to form Daedalus. Shards of the smaller fell, devastating the land and its people. Notions of magic and science were tilted on their heads. The Shard Falls appeared, as did new magicks and strange new creatures.

Trivia
Old Britannia has two moons: Trammel and Felucca.