This painting is a wonderful representation of the prison of Tartarus, a location in Assassin's Creed Odyssey. Tartarus is the Greek underworld, and a place of torment and suffering. The prisoners of Tartarus are condemned to an eternity of pain and misery.
Two skeletons stand on top of gate. The building is in darkness and the sky is overcast. The skeletons are a reminder of the horrors of Tartarus, and they serve as a warning to those who would dare to enter.