| Title | Publisher | Formats | Franchise |
|---|---|---|---|
| Delving Deeper Ref Rules v2: The Adventurer's Handbook | Immersive Ink | Delving Deeper | |
| Delving Deeper Ref Rules v2: The Monster & Treasure Reference | Immersive Ink | Delving Deeper | |
| Delving Deeper Ref Rules v2: The Referee's Guide | Immersive Ink | Delving Deeper |