Cave-In
Level 4
A precarious tunnel ceiling waiting for the wrong footfall to bring the whole passage down.
Stealth DC 22 (trained)
Disable DC 25 Survival (trained) to prop up the tunnel ceiling without triggering a collapse
Collapse [Reaction]
Level 4 · Complexity Simple
Stealth DC 22 (trained)
Disable Survival DC 25 (trained) — to prop up the tunnel ceiling without triggering a collapse
AC 21
HP 46 · Hardness 13
Immunities critical hits, object immunities, precision damage
Trigger A creature moves into the unstable tunnel
Effect The tunnel collapses in a cave-in that deals 4d8+10 bludgeoning damage to the triggering creature and all creatures in area A2 (DC 21 basic Reflex save). On a failed save, the triggering creature is immobilized (Escape DC 21). This collapse fully blocks the tunnel (area A2), making it impassable.