Mystery Magic Number: 605,895,995,773.

Lots of old information about the setting is on the 2E site.

This Earth has had 17 tactical nukes launched in a little over 100 years, when 2/3 of cultures don’t know about steel yet.

Aziza’s Plan (see here) pushed the plot on alt timeline 1, and Prism called the shot to force the game to alt timeline 2.