Toy Soldiers. Small six inch soldiers with advanced military AI making them lethal killing machines, individually as creative and cunning as a special forces SEAL or marine. Together they make an elite unit capable of infiltration, assassination, and all around-fuck-up-your-day force of near unstoppable slaughter.
Though not initially equipped with anything potentially deadly their craftiness allows them to make tools and weapons out of household ordinary supplies.
Once one has been downed (a difficult thing to do since shooting such a small target tends to prove difficult, especially with there high level of teamwork and solid grasp of unit tactics) the others can use the AI chip and copy it to make clones in any other small toy, including barbies. Given enough time they came probably even rig larger things to have the same hi end AI.
The only currently known ways to take them out are EMP, baseball bats, lawnmowers, golf clubs, big feat stomping and other blunt/sharp weapons that can accurately hit a small plastic soldier with sufficient force to break their hardened plastic bodies.
Though after the first attempt to EMP them, any survivors are likely to build protection, and or tactics to prevent further harmful use of EMPs. Once of sufficient force, it is also unlikely to be able to get close enough to them to be able to strike them as they convert RC cars and nailguns into mobile weapons platforms, toaster ovens into tazer tanks, and other crafty homemade weapon systems. Once they have built up to this level of force it is unlikely that even a lawnmower will be able to reach them without being turned back against those that oppose them and their mission.
You should also expect them to cut your means of communication, commit to radio jamming, surveillance and counter surveillance operations if given half the opportunity.
See documentation:



Itâs too bad your kid decided to buy a large inventory of them for the toy store down the street just before they were realized to have âgone rogueâ or that nobody realized that the âinnocent plays WITH your child toysâ were actually embedded with military AI by an incompetent, but enthusiast employee of the toy/military chip factory⌠until it was too late⌠And now there is no one around to stop their growing power base.