Omega Event

An Omega Event is an event of tremendous consequences that can lead to the end of civilization.

The term Omega Event is primarily used by the Department of Superhuman Affairs ("DSA") to describe such an event that is facilitated by a superhuman.

Notification of a possible Omega Event can be via a government issued Omega Code Alert.

Known Omega Events
Vampire Plagues - the DSA tested Artemis to make sure she couldn't start one.

A human turned into an invasive artificial intelligence -

A contagious hive-mind breakthrough - the town it occurred in disappeared moments before a DSA sanctioned nuclear strike destroyed the area.

Omega Events from other timelines
The depopulation of the state of Kansas by a future version of Ozma.