Another Piece Of The Puzzle

Objectives
Recover another Vault Key Piece from the Trash Coast.
 * Challenge overcome: 0/1
 * Vault Key Piece: 0/1

Description
The Guardian Angel spoke cryptically of a challenge that awaits in the Trash Coast, and Tannis thinks another piece of the Vault Key can be found there. Given the way things have worked out so far, you're probably going to need to overcome this mysterious challenge before you'll be able to obtain the third fragment of the Vault Key and return it to Tannis.

Completion
This is the third piece of the Vault Key you've brought me. We almost have the complete set now.