Level 18 Blaster
This cavern is close to a sulfur vent deep underground, and the cinder cones marked on the map periodically emit poisonous clouds of sulfur
DC 29: The room smells strongly of sulfur.
DC 33: A lingering haze near the cinder cones marks where the sulfur is strongest.
DC 29: Concentrations of sulfur are frequently poisonous, but the poison dissipates rather quickly in a large cavern such as this.
At the start of each turn, roll 1d6 twice. The indicated cinder cones emit a cloud of poisonous sulfur.
All living creatures within the area
+21 vs. Fortitude
2d10 + 5 poison damage and ongoing 10 poison (save ends)
Dungeon Magazine 170
, page(s) 38.