This twisted wooden spike was carved from the misshapen limb of an ash tree.

A sleeping spike becomes invisible 1 round after you plant it firmly in the ground. Thereafter, as soon as any creature comes within 10 feet of it, the spike emits a sleep effect (Will DC 17 negates) in a 20-foot-radius burst that affects all creatures with 10 Hit Dice or fewer. The spike is destroyed when the sleep effect is triggered.
During the round that a sleeping spike remains visible after being planted, any creature can safely remove it from the ground (a standard action) to render it harmless and ready for reuse.

Prerequisites: Craft Wondrous Item, symbol of sleep.
Cost to Create: 1,500 gp (plus 500 gp for base item), 120 XP, 3 days.