Trial by Ice Trap

Level 5Hazard
HazardLargeRemaster
AC
0
HP
0
Speed
0 ft.
Perception
+0
Fort
+0
Ref
+0
Will
+0
Stealth
+16
Recall Knowledge DC 20 (arcana)
Disable DC 23 thievery (trained) to jam the vent closed or DC 26 arcana (expert) or DC 26 occultism (expert) to disable the nearby magical sensor

A hidden vent in the ceiling is attached to a reservoir of freezing alchemical reagents that can create a bone-chilling cloud.