Delicate Crumbling Floor

Level 3Hazard
HazardMediumLegacy
AC 22
HP 52 (BT 26)
Speed 0 ft.
Fort +15
Ref +9
Will +0
Perc +0
Size Medium
Common
Stealth +13
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.
Immunities critical hits, precision
Recall Knowledge arcana DC 18

Abilities

Collapseoffensive

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.

Description

At a cursory glance the tunnel appears to be little more than a waterlogged chamber.