Underworld Guardians are beings tasked with guarding the borders of the afterlife or the realms of the dead. They prevent souls from escaping or protect the secrets of the underworld from intruders. These beings are often fearsome, powerful, and closely associated with death and the passage of souls.
In myths, creatures like Cerberus or the Greek Charon embody the role of Underworld Guardians, ensuring the balance between life and death.