Assassin's Creed Odyssey: Return the eye to Markos - An Eye for an Eye

Return the eye to Markos is an objective in Assassin's Creed: Odyssey (ACOD).

Memory

With the Obsidian Eye collected, it is time to sneak back out of Cyclops's Lair.
Once again, wait for the guards to be looking away.
Leave the room through the doorway, going to the North.
Head to the East into the room there and then continue to the North, leaving the building.
In the second room, close to the outer portion of the building, take a moment to look for guards.
When they are clear, slip back out of the building and head to the East.
Sneak on up the mountainside and then make your way back to Markos's Vineyard.