| Answer | Crossword Clue |
|---|---|
| RING | Wagnerian tetralogy |
| RING | Wagnerian tetralogy (with "The"). |
| PARTIV | Tetralogy conclusion |
| PARTIV | Tetralogy ender |
| SERIES | Trilogy or tetralogy |
| EPIC | Tetralogy, e.g. |
| PARTIV | Last of a tetralogy |
| RAJQUARTET | Paul Scott tetralogy, with "The" |
| RABBITREDUX | Second novel in Updike's tetralogy |
| RHEINGOLD | One of a musical tetralogy. |
| DIEWALKURE | Second of a musical tetralogy |
| RAMA | Title spaceship in a classic sci-fi tetralogy |
