On this page of Assassin's Creed Odyssey guide, you'll find a description of Ainigmata Ostraka (Ostracons) in Lokris. Only one puzzle is waiting for you here - Red Aroma.
Location of Ainigmata Ostraka: Leader's House, near the sea pier.
How to solve: The center of the red lake. Dive in the water, swim into the tunnel and reach the figure.