Delicate Crumbling Floor
Level 3HazardHazardMediumLegacy
AC
22
HP
52 (BT 26)
Speed
0 ft.
Perception
+0
Fort
+15
Ref
+9
Will
+0
Stealth DC
13
Immunities critical-hits, precision
Recall Knowledge DC 18 (arcana)
Abilities
Collapse↺
Trigger A creature moves into the hazardous area
Effect The flooring crumbles, breaking apart under the creature and sending them into the stagnant water below, dealing (4d12+10) bludgeoning damage (DC 17 reflex save). That creature can use the Grab an Edge reaction to avoid falling.
Disable DC 20 acrobatics (trained) to safely navigate the wet floor without stepping on any loose masonry or DC 22 thievery (expert) to cause a controlled collapse without any danger to the PCs.
At a cursory glance the tunnel appears to be little more than a waterlogged chamber.