What is hades challenged by?

Hades, the Greek god of the underworld, is often challenged by various forces, including the other Olympian gods and heroes. His authority is tested by figures like Persephone, whom he abducts, leading to conflicts with Demeter and ultimately Zeus. Additionally, myths often depict Hades facing threats from mortals seeking to escape the underworld, such as Orpheus, who attempts to retrieve his wife Eurydice. These challenges highlight the tension between life and death and the boundaries of Hades' dominion.