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Collapsing BridgeHazard 16

Unique Complex Mechanical Trap 
Source Claws of the Tyrant pg. 67
Complexity Complex
Stealth +38 (expert)
Description Metal supports twist and shear off the bridge, causing stretches of the structure to collapse.
Disable DC 40 Engineering Lore to identify and reinforce weak points, DC 43 Crafting (master) to construct secondary supports, or DC 45 Athletics (legendary) to reinforce the bridge with found materials; three successes are required to halt the collapse
AC 39, Fort +30, Ref +25
Hardness 25, HP 104 (BT 52); Immunities critical hits, object immunities, precision damage
Bridge Collapse [reaction] Trigger A Medium or larger creature steps onto the bridge’s weak point; Effect The bridge collapses in the creature’s square, then rolls initiative. The DC to Grab an Edge on the bridge is 38. Once the bridge begins to collapse, the river’s Swim DC increases to 36 as the water churns with the falling debris. A creature that starts its turn swimming within 15 feet of the bridge takes 10d6 bludgeoning damage (DC 41 basic Reflex save).
Routine (1 action) The collapse radiates out from the damaged section of the bridge. All squares adjacent to a collapsed section also fall into the water.