Embed
The attack embeds a barbed needle or another lingering effect in the target. The first time each round the target moves 5 feet or more in a single action (voluntarily or not), it takes the listed damage. The target can remove the embedded object with a standard action, dealing the listed damage in the process. Alternatively, with a successful Medicine check (DC = 15 + 1-1/2 the weapon’s item level), another creature can remove the object from the target and deal no damage. Multiple embedded objects each deal their listed damage and must be removed one at a time.
Source
Armory pg. 31