| Code | Title | Description | Setting in Mystara | Cover |
| D&D Hollow World | Campaign Source | Explicit | |
|
| HWA1 | Nightwail | Adventure | Explicit | |
| HWA2 | Nightrage | Adventure | Explicit | |
| HWA3 | Nightstorm | Adventure | Explicit | |
| HWQ1 | The Milenian Scepter | Adventure | Explicit | |
| HWR1 | Sons of Azca | Campaign Source | Explicit | |
| HWR2 | Kingdom of Nithia | Campaign Source | Explicit | |
| HWR3 | Milenian Empire | Campaign Source | Explicit |