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Toppling ShelvesHazard 4

Legacy Content

Mechanical Trap 
Source Pathfinder #188: They Watched the Stars pg. 58
Complexity Simple
Stealth DC 18 (trained) to notice the shelf's precarious instability
Description This stone bookshelf is badly compromised. It's just one push away from toppling over.
Disable DC 22 Thievery (expert) or Engineering Lore (trained) to shore up the shelf
AC 18, Fort +8, Ref +8
Hardness 8, HP 30 (BT 15), any attack that fails to destroy the shelf triggers its Topple reaction; Immunities critical hits, object immunities, precision damage
Topple [reaction] Trigger The shelf is attacked or touched forcefully (such as by a creature Shoved into it); Effect The shelf tumbles over in the direction opposite its triggering creature, crashing onto the ground in a 10-foot-by-10-foot area. Creatures in the area take 4d8+10 bludgeoning damage (DC 25 basic Reflex save). A creature that critically fails its save falls prone. The affected area becomes difficult terrain.

If the toppling shelf crashes into a space occupied by another toppling shelf, it triggers that shelf's Topple reaction. This can result in a chain reaction that causes multiple shelves to Topple, one after the other.