Lost Cause

Lost Cause was a virtual representation of one of Bayek's genetic memories, relived by Layla Hassan through the portable Animus HR-8.

Description
Bayek found the riddle in the Shur Quarry in Sinai.

Riddle
''Northeast of the Shur Quarry is a testament to man's folly, where they built two short walls to capture what cannot be caught. Though their target flows in and out at will, I am stuck in the center of their useless trap.''

Reference

 * Assassin's Creed: Origins