The eternally cursed figure in Greek legend known for his punishment is Tantalus. In myth, Tantalus dared to dine with the gods without invitation and, in a fit of arrogance, offered his son as a sacrifice. As a result, he was condemned to suffer eternally in the afterlife, standing in a pool of water beneath a fruit tree but unable to drink or eat. This punishment symbolizes the consequences of hubris and the desire to overreach one’s bounds, serving as a cautionary tale in Greek mythology.