II Legion "The Conquerors of Steel"
Legion Name: The steel breakers
Primarch: Jovian Malleolus
First Captain/Legion Master: Argento Lombardi
Asymmetrical warfare: The legion specialized in guerrilla and sabotage warfare, crippling enemy factories, war machinery, communication, and energy sources. They collapsed the infrastructure needed to sustain any war effort.
Anti Armored support: Thanks to their specialized weapons and mutations, they offer support against armored forces exceptionally well. Their tesla/arc weapons leave most heavy vehicles inoperable as they fry the circuits, make the power source combust, or make any explosive inside the vehicle explode. They are exceptionally effective against any machine or man wielding any kind of energy weapon since their arc weapons generally make them malfunction in a gruesome fashion.
While they specialized in sabotaging their enemy's forces and rendering their war machinery useless, they often aimed for range combat with armored support whenever they engaged in a large-scale conflict. This doesn't mean they are incompetent in melee combat; they just don't see the logic of engaging mele in the middle of a warzone, saving mele and short-range engagement to their more precise engagement.
Characteristic Legion Training:
Endure Anything: Training in this chapter emphasizes the need for any squad to be ready to endure any trials they find themselves in. They produce tough, durable brothers with diverse specialties.
Rare Weaponry: The Legion has a large stock of weaponry considered rare amongst the other Chapters. Wielding one of these weapons in battle is a symbol of honor.
Special Vehicle: This Chapter prefers to ride into battle in more modern conveyances. While the traditional Space Marine vehicle is the Rhino, other Chapters may use rare vehicles as primary transport. Examples: Modified Rhino, Land Raider, or Land Speeder
Warcry: "From the flesh and blood that had been taken from us, we endure the curse of steel!
The geneseed have a particular mutation that over-stimulates the cells of the body, making them generate and store energy which can later be released as electricity, which is shown in the astartes as glowing blue marks on the body. This mutation makes the acceptance rate somehow low. This required the astartes to use modified equipment to avoid malfunctioning.
"Purity of Man." Jovian Malleolus has taught his sons the belief in the strength of the human body and humanity as a whole, and anything that contradicts that belief is despised. They understand the great sacrifice of men and women during the war when they risk their lives and bodies for their duties. Those who use cybernetic implants or prostheses after putting their life on the line for their fellow soldiers should be held in high regard and respect as they lose something that can't be recovered.
They had an unspoken animosity with the mechanicus for the same reason. They butchered their bodies, willingly replacing the gift of flesh with the cursed metal. It filled them with disgust and contempt. Any person who defiles the human body, either their own or someone else's, should be punished because they are taking away something that can never be recovered. In modern times this belief has also extended against the forces of chaos, the genestealer and tyranids.
Before being assigned to their primarch, they were known as the machine breaker. Sadly, The legion didn't earn such a title because of a glorious battle but because of their geneseed mutation, which made the legion members naturally generate and expel electricity through their bodies. This led to many equipment and vehicles constantly malfunctioning by the sudden discharge of electricity, which led to the mechanicus shunning them, leaving them quite often ill-equipped and fending from themselves.
After The Emperor brought them to their primarch, he began to use his influence to aid his men, giving them proper equipment for their unique bodies and teaching them how to harness the power of their mutation. The legion began to take the teaching of their primarch at heart, especially after hearing his stories about his life on a planet controlled by an AI and how they managed to beat it. Soon they become one of the most resourceful and self-reliable legions, primarily because of their strained and almost hostile relationship with the Adeptus mechanicus, who shunned them for so long.