Chaos in Zion

Chaos in Zion is a side quest in the Fallout: New Vegas add-on, Honest Hearts.

Detailed walkthrough
This quest begins when the Courier kills any storyline-essential character, or openly kills friendly tribals. The player is then required to travel to White Bird's Cave to retrieve the Zion Canyon map. They are then instructed to travel back to the Southern passage, through which they can return to the Mojave Wasteland.