Talk to Markos to continue with this story quest. He’ll give you the task to steal the Cyclop’s Obsidian Eye from his lair. His hideout is located only around 200 meters from the vineyard so call Phobos and ride towards it. There’s a hill beside the hideout where you can sneak from. When you’re near, call Ikaros to scout the area and tag the enemies and objects of interest, including the eye’s location.
Approach the lair from the hill and take out the lookouts in the ledges. Next, make your way to the lot behind the building where the target is located. This is a good position to take out patrols and any sleeping enemies since you can conveniently hide their bodies in the vegetation behind the building. Take your time in taking out nearby guards, without minding the ones guarding the yard and the other side of the perimeter. This approach will also allow you to sneak inside the building through the back door.
While you’re here, make sure to complete the location objectives. The treasure can be looted by entering through the back door and the bandit leader may be patrolling around. If you can’t see him, have Ikaros scout again until you’re able to tag him. Stalk the bandit leader and kill him stealthily.
After covering your tracks, sneak inside the building again but this time you’ll have to sneak through the main yard. Use the cover and keep an eye on the bandits’ movements so you can sneak past them. After looting the eye, backtrack to the back door and escape through the woods. Once you’re in a safe distance, call your horse and ride back to the vineyard. Hand over the eye to Markos to complete the quest.