| Name | Volcanus |
| Type | P |
| Weight | 0.5 |
| Rarity | toxic black gas |
| Text | A toxic black gas that leaks from fissures in the rock. Any creature within 10 ft. must make a successful DC 14 Constitution saving throw or take 1d4 poison damage and remain poisoned for 10 minutes. Source: Monsters of the Underworld p. 91 (Homebrew) |