In the aftermath of Judgment Day, we fled to the Exclusion Zone and sought refuge underground. This is what is left of our fallen civilization.

The Ninja: From Reality to Myth

Ironically, when the bots began integrating pop culture media referencing ninjas from the 20th and 21st centuries alongside historical shinobi training manuals such as the Bansenshukai into their ML combat training programming, the world saw actual warrior-spy-assassins akin to those in the movies appear for the first time in the form of the dreaded cyber-ninja.