The Greeks worshiped Hades, the deity of the Underworld and the name of the realm. Odysseus sails to Hades in the epic poem The Odyssey to discover his fate from Teiresias, the blind prophet. He is instructed that he must not harm Helios' animals or he and his soldiers would perish and be forgotten. That is why Achilles does not kill Trojans when they are wounded; this would anger Hades. Hades has two main forms in mythology. As the god of the underworld, he is represented as a grim figure wearing a crown and a robe, with a serpent coiled around his waist. As king of the dead, he is described as a handsome man who receives guests at a banquet table laden with food. This second form appears in ancient art. In some cultures, including Ancient Greece, people believed that if you did not honor your ancestors you would never reach old age or death. So they made many statues of their relatives in hopes that good luck would come their way. Today this practice is called "ancestor worship" and some families still make offerings at shrines or tombs every year in hope of winning health or prosperity for themselves or others. Ancestors were seen as vital to the living because they carried on living people's names and fought wars for them. If someone had been cruel to their ancestor, they would receive punishment for it in the form of disease or misfortune.