Toppling Shelves

Trigger 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 --- 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 (DC 25 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.