Backstage Pass

Backstage Pass was a virtual representation of one of Kassandra's genetic memories, relived by Layla Hassan through the portable Animus HR-8.5.

Riddle
''Head to the theater in Athens. With the right connections, I always get to watch the play from backstage. Find me on an actor's mask.''

Outcome
Kassandra found and recovered the treasure.

Reference

 * Assassin's Creed: Odyssey