In Norse mythology, the character imprisoned in a tower is the goddess Idun. She holds the golden apples of immortality, essential to the gods' eternal youth. Idun's abduction by the giant Thjazi triggers a series of events that threaten the gods, showcasing themes of captivity and her vital role in sustaining divine life. This myth reflects the interconnectedness of beings and the precarious balance of power between gods and giants. Idun’s story emphasizes the struggles for control over essential resources and the consequences of those struggles in the mythic realm.