Toppling Shelves
HAZARD 4 +8 (trained) to notice the shelf's precarious instability
This stone bookshelf is badly compromised. It's just one push away from toppling over.
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); Immunities precision, critical hits
Topple
The shelf is attacked or touched forcefully (such as by a creature Shoved into it)
Any attack that fails to destroy the shelf triggers its Topple reaction
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 (DC 25 basic Reflex). 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.
Pathfinder Adventure Path: GatewalkersORC