Sea of Sand 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 Temple of Horus within Letopolis.
Riddle
In the southeast of Iment Nome lies a broken ship. If you meditate til morning, an X will mark my hiding spot.
Outcome
Bayek found and recovered the treasure.