Source Legacy of Fire Player's Guide

Aura faint divination; CL 1st
Slot none; Price 50 gp; Weight 1/2 lb.

This crystalline hand-sized scorpion figurine is so full of cracks and occlusions that it looks as if it could fall apart at any minute. As a standard action you may throw the sentinel scorpion to the ground, causing it to explode into crystalline shards that cover the ground in a 10-foot burst. When any creature steps in the area, the shards make popping sounds as loud as the audible version of the alarm spell. A creature moving in the area of the shards has a 10% chance each round of stepping on the stinger. The stinger injects Large scorpion venom and is treated as a trap (Perception DC 20, Disable Device DC 20). After 2 hours, the shards decay into harmless powder.

Craft Wondrous Item, alarm; Cost 25 gp