Probe killer/Legends

Probe killers were tiny assassin droids that could be carried inside the small pits on the head of the larger assassin probes, where they lay dormant until the assassin probe activates them. They were similar in appearance to their larger companions, but several times smaller. In 22 BBY, assassin probes and probe killers were used on the Coronet in an attempt to assassinate Duchess Satine Kryze. Most of the droids were destroyed in the initial attempt, but Obi-Wan Kenobi deliberately left one alive so that he could discover who placed the droids aboard the ship.