Hungry Gods is a side mission found on Kephallonia Island.
Open the map and locate the side mission Hungry Gods. Head over to it and speak with the man outside the cave.
Once inside and near the statue, investigate the magnifying glass locations, then go through the crack in the wall. Also, feel free to steal if nobody is there, but I’d hold off on doing that if there’s someone praying.
There are a variety of enemies within the cave, so prepare yourself to assassinate some bandits. After they’re clear, there’s a Treasure up top.
Exit the cave and go back to the man for a mission success.