# Poisonous Gas *Generic Hazard* Poisonous gas is usually encountered in an enclosed space, such as a sewer or sealed tomb. The gas fills as much space as it can, up to a maximum of ten 10-foot [Cubes](/Rules/Source/variant-rules/cube-area-of-effect-xphb.md). The transparent gas carries a foul odor. The gas is continuously or periodically replenished by some natural or magical source, though a strong wind disperses the gas for 1 minute. Any creature that enters poisonous gas for the first time on a turn or starts its turn there makes a DC 12 Constitution saving throw, taking `dice:1d10|noform|noparens|avg|text(5)` (`1d10`) Poison damage on a failed save or half as much damage on a successful one. Creatures in the gas also have [Disadvantage](/Rules/Source/variant-rules/disadvantage-xphb.md) on [Death Saving Throws](/Rules/Source/variant-rules/death-saving-throw-xphb.md). ## At Higher Levels You can scale the hazard for higher levels by increasing the Poison damage and the save DC, as shown in the following table. | Levels | Poison Damage | Save DC | |--------|---------------|---------| | 5–10 | 11 (`dice:2d10\|noform\|noparens\|avg` (`2d10`)) | 14 | | 11–16 | 22 (`dice:4d10\|noform\|noparens\|avg` (`4d10`)) | 16 | | 17–20 | 55 (`dice:10d10\|noform\|noparens\|avg` (`10d10`)) | 18 | ^levels-poison-damage-save-dc *Source: Dungeon Master's Guide (2024) p. 77*