Methane Flue
Level 8HazardHazardMediumLegacy
AC
10
HP
0
Speed
0 ft.
Perception
+0
Fort
+0
Ref
+0
Will
+0
Stealth
+18
Recall Knowledge DC 24 (arcana)
Disable DC 28 survival to dig around the vent in a way that diffuses the fumes
Invisible but highly flammable natural gas has built up beneath the ground, where geological pressure can ignite it.