To investigate the sacred pool in the Temple of Sobek in Krokodilopolis in Sobek’s Tears in Assassin’s Creed: Origins interact with the blood on the rocks on the right side of the enclosure. Interact with the blood on the stairs. Interact with the jar at the bottom of the stairs. Climb up the back wall of the enclosure and the outer wall of the Temple of Sobek. Drop down on the outside and enter the sewers. Interact with the blood on the ground. .
As found on Youtube