The Sentinels are highly agile, guard dogs of the real world, outside the digitally controlled Matrix universe created by the machines. Affectionately called squidies by the few thousand human survivors of Zion; who are hunted 24 hours a day 7 days a week by the Sentinels. Unfortunately for the last people on earth, the squidies weren’t programed with the affection that the people of Zion nicknames implies.
As the Sentinels power themselves from the stored energy created by coma-induced human beings inside the matrix; who unwittingly power the sentinels that hunt the only free survivors of Zion, armed with laser cutting tools that can breach human vessels and provide unexpected points of entry into Zion vessels.
In close-quarters combat, humans don’t stand a chance against the multi-clawed pincers that can grab and crush human bones to dust or spear the human torso through like pin cushions. The sentinel doesn’t always have to get close to kill either. With its noise detection capabilities and bug like bombs they hurl from a distance, they can completely destroy a Zion vessel in moment after acquiring the target.
Often traveling in packs, the sentinels become more and more numerous the closer to the surface of the planet you get. Keeping the people of Zion penned in to their little hole-in-the-ground close to the center of the Earth for warmth. The Sentinels attack in large groups, seeming to connect and work as one larger machine to destroy larger targets. The Sentinels are also used as shields to protect larger machine equipment like drills.
The only weapons the people of Zion have to resist the Sentinels are there hover ships. Armed with machine guns and EMP’s (Electromagnetic pulse) to disable the electronics in the Sentinels. If the Sentinels get into Zion, the city is defended with APU’s and shock rifles. Regardless of Zions defenses, the Sentinel’s numbers are simply overwhelming.