Thjazi is a figure from Norse mythology, known as a giant or jotunn. He is often associated with the elements of nature and is depicted as a powerful being who can control the weather. Thjazi is particularly famous for his role in the myth of Idun, the goddess of youth, whom he kidnaps to gain access to her magical apples that grant immortality. In the myths, Thjazi's actions lead to significant consequences for the gods, as they rely on Idun's apples to maintain their youth. His story ultimately ends with his defeat by the gods, showcasing the ongoing conflict between the giants and the deities in Norse lore.