The Machines, created initially (at least on earth) during the 1st Machine War, and ever since then they have proven to be extremely effective and efficient foot soldiers in the never ending war against the Androids. According to 9S, the Machines have a natural ability to develop better ways to wage wars, producing new machine variants or evolving the way they are able to utilize their weapons.
As of the 14th Machine War, the Machines grew less hostile over time due to the fact that if they had allowed to remain in a bloodlusted state they would have easily wiped out the remaining androids, something the Red Girls knew would halt their evolution and take away the only remaining purpose the machines had, their final order from their alien masters ordering them to destroy the enemy.
Machines come in several basic models that are able to adapt to a specific location such as wearing knights armor while in the forest kingdom or circus style clothing while in the amusement park.
Behaviorally, it is suggested by dialogue made by 9S that machines were previously non sentient or semi sentient at best, as behavior such as speech or organized activities were considered unusual and out of character, and an email from the "Council of Humanity" suggests that the machine activity seen in game is considered irregular.
By the events of the game however the machines intelligence has notably increased, as group activities, speech and even organized communities and faction begin cropping up among their ranks and machines like Adam and Eve as well as the Red Girls and Pascal have intelligence superior to their android counterparts seeing as they have access to the Machine Network.
Because of the Machine Network, and their cores, machines have achieved a type of networked immortality similar to that of YoRHa androids. So long as a machine remains connected to the Network than they are effectively immortal. Examples of this concept include Adam and Eve, who were otherwise undefeatable until they were disconnected from the network.
It is not quiet clear when these machines were first manufactured or their purpose, as unlike their land based brethren, these aquatic machines did little in the way of exterminating or outcompeting the animals they were meant to mimic and in some cases benefitted the ecosystem.
Interestingly, by the time of Automata, manufacturing of these machines has completely halted meaning that the number of these machines are slowly but gradually decreasing, whats more is unlike most machines, these machines are not connected to the network and as such their intelligence and evolution remains stagnant.
- Small Stubby
- Medium Biped
- Small Flyer
- Medium Flyer
- Small Biped
- Small Exploder
- Goliath Biped
- Reverse-Jointed Goliath
- Enhanced Leg Power Goliath Biped
- Medium Exploder
- Linked Sphere Type
- Medium Quadruped
- Small Sphere
- Multi-leg Medium Machine
- Rampaging Small Stubby
- Rampaging Medium Biped
- Rampaging Small Biped
Each of these comes with their environment specific models as well as the enhanced models, black and red machines with higher base stats than the normal versions.