In Greek mythology, the creature born from the blood of Uranus is the Furies or the Erinyes. When Uranus was castrated by his son Kronos, his blood fell to the earth, which produced these avenging spirits. The Furies are often depicted as fearsome female figures associated with vengeance and retribution, particularly against those who violate certain moral and social laws. Their role underscores the themes of justice and punishment prevalent within Greek mythology, serving as a reminder of the consequences of one's actions in both mortal and divine realms.