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In place of the heart and lungs of a human is a Machina's Core. The Core is responsible for supplying the Machina's body with useful materials and power. Anything the Machina eats, drinks, or breathes-in travels to the first part of the Core; the Matter-Shredders, located in the top spaces of her chest cavity. M2 Nanomachines and Machinium are immediately filtered out and enter the Machina's bloodstream. Next, matter is separated into free molecules. Useful molecules and atoms are again diverted into the bloodstream. Anything not deemed useful at the end of this process enters the Mass-Reactor in the center of the chest cavity. There, matter is converted almost 1:1 into energy to power the Machina's body. Leftover subatomic particles are taken to smaller organs attached to the Mass-Reactor where they can be fused together to make atoms and molecules the Machina needs but cannot find elsewhere. Due to the extremely complex mathematics involved in these reactions, a [https://wiki.machinamaincluster.com/index.php/M2-Based_Life-Forms#Larvae Larva] is needed for the Core to operate at full output. This Core Larva monitors all the Core's processes and performs the unfathomable calculations necessary to maintain the reactions in the Core.

In place of the heart and lungs of a human is a Machina's Core. The Core is responsible for supplying the Machina's body with useful materials and power. Anything the Machina eats, drinks, or breathes-in travels to the first part of the Core; the Matter-Shredders, located in the top spaces of her chest cavity. M2 Nanomachines and Machinium are immediately filtered out and enter the Machina's bloodstream. Next, matter is separated into free molecules. Useful molecules and atoms are again diverted into the bloodstream. Anything not deemed useful at the end of this process enters the Mass-Reactor in the center of the chest cavity. There, matter is converted almost 1:1 into energy to power the Machina's body. Leftover subatomic particles are taken to smaller organs attached to the Mass-Reactor where they can be fused together to make atoms and molecules the Machina needs but cannot find elsewhere. Due to the extremely complex mathematics involved in these reactions, a [https://wiki.machinamaincluster.com/index.php/M2-Based_Life-Forms#Larvae Larva] is needed for the Core to operate at full output. This Core Larva monitors all the Core's processes and performs the unfathomable calculations necessary to maintain the reactions in the Core.

In the lower areas of the chest cavity attached to the Core assembly are the pumps for the Machina's circulatory system. The organs there pump the Machina's blood around her body and monitor the raw materials in the blood to ensure supply from the Core is sufficient. Incoming blood goes through the pumps, collects power and materials from the Core, then travels around the body before returning. Notably, the circulation systems do not feature a heartbeat. As the pump organs develop around the human heart, the heart will stop beating, which can be significant moment in a Machina's early [https://wiki.machinamaincluster.com/index.php/Machina_Development#Category_1 development].

In the lower areas of the chest cavity attached to the Core assembly are the pumps for the Machina's circulatory system. The organs there pump the Machina's blood around her body and monitor the raw materials in the blood to ensure supply from the Core is sufficient. Incoming blood goes through the pumps, collects power and materials from the Core, then travels around the body before returning. Notably, the circulation systems do not feature a heartbeat. As the pump organs develop around the human heart, the heart will stop beating, which is a significant moment for the Machina in her early [https://wiki.machinamaincluster.com/index.php/Machina_Development#Category_1 development].

Due to how the Core only requires matter for fuel, any matter will do for survival. However, Machina retain the ability to fully appreciate human food with far greater sensory definition. In addition, because most metals are nutritious for Machina, their bodies also interpret these metals to be tasty. As a result, both human food and most metals have appreciable tastes for a Machina.

Due to how the Core only requires matter for fuel, any matter will do for survival. However, Machina retain the ability to fully appreciate human food with far greater sensory definition. In addition, because most metals are nutritious for Machina, their bodies also interpret these metals to be tasty. As a result, both human food and most metals have appreciable tastes for a Machina.

== Brain ==

== Brain ==

A Machina's brain is an extremely complex biomechanical quantum computer. The biomechanical circuitry of the brain is continuously optimized and reshaped to increase efficiency and throughput. This is achieved thanks to the neuroplasticity inherited from the human brain it is based off. On its own, a Machina's brain is capable of incredible amounts of multitasking as well as massive amounts of calculations per second, exceeding humanity's best supercomputers by orders of magnitude. A large portion of a Machina's processing power is used to interpret her sensory data, as well as monitoring feedback from her systems in order to regulate their processes. Another portion of a Machina's processing power is devoted to supporting the [https://wiki.machinamaincluster.com/index.php/Machina_Behaviour#Clusters Cluster] she belongs to, where the Machina assists her sisters and her [https://wiki.machinamaincluster.com/index.php/Machina_Classes#Queen_class Queen] with processing on various tasks as well as simply communicating her knowledge with them.

A Machina's brain is an extremely complex biomechanical quantum computer. The biomechanical circuitry of the brain is continuously optimized and reshaped to increase efficiency and throughput. This is achieved thanks to the neuroplasticity inherited from the human brain it is based off. On its own, a Machina's brain is capable of incredible amounts of multitasking as well as massive amounts of calculations per second, exceeding humanity's best supercomputers by orders of magnitude. A large portion of a Machina's processing power is used to interpret her sensory data, as well as monitoring feedback from her systems in order to regulate their processes. Another portion of a Machina's processing power is devoted to supporting the [https://wiki.machinamaincluster.com/index.php/Machina_Behaviour#Clusters Cluster] she belongs to, where the Machina assists her sisters and her [https://wiki.machinamaincluster.com/index.php/Machina_Classes#Queen_class Queen] with processing on various tasks as well as simply communicating her knowledge with them.

Machina do need to sleep on occasion to reset their processes and allow for optimization to occur. During this time the M2 Nanomachines carry out physical improvements as well as optimize and streamline her neural network, thought patterns, and memories. As her body carries out this mental optimization it can feel like a dream to the Machina, as old memories appear in her mind and then leave as they are processed. These rest cycles have the added benefit of powering down the rest of the Machina's body so it too can be maintained by her M2 Nanomachines without the stresses of activity impeding them.

Machina do need to sleep on occasion to reset their processes and allow for optimization to occur. During this time the M2 Nanomachines carry out physical improvements as well as optimize and streamline her neural network, thought patterns, and memories. As her body carries out this mental optimization it can feel like a dream to the Machina, as old memories appear in her mind and then leave as they are processed. These rest cycles have the added benefit of powering down the rest of the Machina's body so it too can be maintained by her M2 Nanomachines without the stresses of activity impeding them.

All Machina are futanari, possessing a complete set of female reproductive organs as well as a functional penis at least. A Machina's vagina leads to their womb, which is enlarged to take up most of their abdominal cavity. The womb is used to receive semen from other Machina, which is absorbed by the walls of the womb. Liquid Machinium and M2 Nanomachines that comprise the semen are allowed to enter the bloodstream and share Gene-Code improvements with the Machina's own M2 Nanomachines. The Machina's ovaries are very enlarged, and their purpose is to both create Larvae eggs which grow in the Machina's womb, and to create semen for her penis to ejaculate.

All Machina are futanari, possessing a complete set of female reproductive organs as well as a functional penis at least. A Machina's vagina leads to their womb, which is enlarged to take up most of their abdominal cavity. The womb is used to receive semen from other Machina, which is absorbed by the walls of the womb. Liquid Machinium and M2 Nanomachines that comprise the semen are allowed to enter the bloodstream and share Gene-Code improvements with the Machina's own M2 Nanomachines. The Machina's ovaries are very enlarged, and their purpose is to both create Larvae eggs which grow in the Machina's womb, and to create semen for her penis to ejaculate.

All Machina possess a penis, though there are two different styles of penis. Machina who lack external testicles are able to retract their penis into their bodies. The head of their penis will appear to be their clitoris until the penis is erected. Machina with testicles cannot retract their penis. For the most part it simply waves around in its erect state which can be maintained indefinitely, though if the Machina wants to, she can make it go semi-soft. Most Machina that were formerly human males will possess testicles by default, whilst any Machina who wants a set of testicles can easily gain them by bonding a Larva to the base of their penis.

All Machina possess a penis, though there are two different styles; with and without testicles. Machina who lack external testicles are able to freely retract their penis into their bodies. The head of their penis will appear to be their clitoris until the penis is erected. Machina with testicles can retract both their balls and penis at once, but not selectively. Furthermore, their testicles must not be too large to fit within their abdominal pouch alongside their other sex organs. For some, this means they must orgasm to empty and deflate their testicles, which may pop back out along with their penis after a while. For others with very large testicles, they are stuck with their penises permanently out. For the most part a Machina penis simply waves around in its erect state which can be maintained indefinitely, though if the Machina wants to, she can make it go semi-soft. Most Machina that were formerly human males will possess testicles by default, whilst any Machina who wants a set of testicles can easily gain them by bonding a Larva to the base of their penis. If a Machina does not want external testicles, she can have them moved internally and fused to her ovaries like any other Machina without external testicles.

Both a Machina's ovaries and testicles will create semen in response to the output levels of their Core. If the Core output raises, semen production will rise with it due to increased abundance of power and materials. An excited Machina will leak semen as a result of not being able to hold it all in, similar to her breastmilk.

Both a Machina's ovaries and testicles will create semen in response to the output levels of their Core. If the Core output raises, semen production will rise with it due to increased abundance of power and materials. An excited Machina will leak semen as a result of not being able to hold it all in, similar to her breastmilk.

=== Thrones ===

=== Thrones ===

All [https://wiki.machinamaincluster.com/index.php/Machina_Development#Category_4 Queen-class] Machina have a Throne, which is an evolved form of a regular Machina's equipment. The key difference is that a Throne has its own Core, and as such it generates its own power rather than needing to be supplied with power from the Machina. This second Core can also save a Queen from dying due to fatal damage to her primary Core.. There are two main varieties of Throne: Fusion-type Thrones and Vehicle-type Thrones.  

All [https://wiki.machinamaincluster.com/index.php/Machina_Development#Category_4 Queen-class] Machina have a Throne, which is an evolved form of a regular Machina's equipment. The key difference is that a Throne has its own Core, and as such it generates its own power rather than needing to be supplied with power from the Machina. This second Core can also save a Queen from dying due to fatal damage to her primary Core. There are two main varieties of Throne: Fusion-type Thrones and Vehicle-type Thrones.  

Fusion-type Thrones are still fused to the Machina's body like larger versions of regular Machina equipment. They often have extremely-advanced systems in them that grant the Queen very unique abilities. Like regular Machina equipment, the Fusion-type Thrones are difficult to remove, but can be done in the presence of a Hive as outlined above.

Fusion-type Thrones are still fused to the Machina's body like larger versions of regular Machina equipment. They often have extremely-advanced systems in them that grant the Queen very unique abilities. Like regular Machina equipment, the Fusion-type Thrones are difficult to remove, but can be done in the presence of a Hive as outlined above.