| Obstacle/Hazard | Effect | |||
| Acid tank | 1d6 damage per round, or 10d6 per round for total immersion; plus poison fumes. | |||
| Antimagic field | Negates all spells or magical effects. | |||
| Dimensional anchor trap | Blocks bodily extradimensional travel. | |||
| Hurricane-force winds | Ranged attacks impossible, flight virtually impossible. | |||
| Lava pit | 2d6 damage per round, or 20d6 per round for total immersion; plus continuing damage. | |||
| Permanent prismatic sphere | Requires seven different spells to bypass. | |||
| Permanent solid fog | Move at one-tenth normal speed, -2 penalty on attack and damage (good when coupled with incorporeal monsters). | |||
| Permanent wall of force | Blocks most spells and ethereal travel, can't be dispelled. | |||
| Three-dimensional dungeons | Levitation/flying required to move between areas. | |||
| Unconnected rooms | Teleportation required to move between areas. | |||
| Variable gravity | As reverse gravity, but direction random each round. | |||