| PROSERPINA | Goddess of the underworld |
| HEL | Goddess of the underworld |
| HECATE | Foolishly teach about energy shown by the goddess of the underworld (6) |
| STYX | Goddess of the underworld whose name means "shuddering" |
| LOGI | Norse god whose children include Hel, goddess of the underworld (4) |
| HERACLES | One of the labours of this warrior was to bring the "monstrous watchdog of the underworld" to the land of the living; after succeeding in doing this, he returned this creature to the underworld. |
| POMEGRANATE | Because the wife of "king of the underworld" had eaten a single seed in the underworld, she had to remain there one-third of the year and spend the other two-thirds with her mother. From what fruit di |
| PLUTO | From the Roman name of the god of the underworld aka "the rich one", the largest of the dwarf planets (5) |
| HADES | (Greek mythology) the god of the dead and the king of the underworld (5) |
| OSIRIS | Ancient Egyptian god who was the ruler of the underworld and judge of the dead (6) |
| CERBERUS | It is described as the three-headed watchdog of the underworld. It devoured anyone who tried to escape the kingdom of Hades. |
| PERSEPHONE | Greek goddess of fertility and queen of the underworld (10) |
| ASPHODEL | In Greek mythology, the flower said to grow in the region of the underworld occupied by ordinary (i.e. non-heroic) souls (8) |
| ORCA | Ancient Spanish mariners' "asesina ballenas" or "whale killer" whose genus, from the name of a Roman god of the underworld, likely refers to said grampus's predatory prowess (4) |
| LATHE | The bilingual river of the underworld (5) |
| CANT | The tilt of the underworld language (4) |
| PLUTONIAN | Note about the author inscribed in map of the Underworld (9) |
| SHADES | One needs sunglasses for the darkness of the underworld (6) |
| DIS | The Roman god of the underworld, also called Orcus or Pluto (3) |
| FARM | Art form involved with origins of the underworld and source of rainbows? (5,4) |
