Incursio

Demon Armor: Incursio is an Armor-type Teigu that takes the form of a short sword with a chain link tassel in its sealed form. Once released, the user is enveloped in a full body armor.

History
Incursio is an Armor-type Teigu created from the flesh of the Danger Beast, Tyrant. The Danger Beast's power was so great that its flesh is still alive within, giving the Teigu the title of "Demon Dragon Armor". In the past, Incursio once belonged to a high-ranking Imperial Army officer and martial arts expert Gensei, who was also Bulat's master, and later came into Bulat's possession and was used during his time under General Liver up until his mission against the Three Beasts with Tatsumi, when he passed it on. Both Bulat and Incursio are so well-known that Wave, upon seeing the Incursio-clad Tatsumi, mistook him for the late 100-Man Slayer in spite of the recent change in form.

Abilities
Due to its origins as the Danger Beast Tyrant, Incursio possesses an aptitude for adaptation and evolution. Aside from its standard capabilities, it continues to evolve as the result of battles against several opponents, gaining new forms and abilities as time goes on. Due to being a full body-armor, Incursio has a near-indestructible defense with the only thing able to pierce it being other Teigu. The armor also greatly enhances the user's physical abilities such as speed, strength and agility. The users of Incursio are also able to wield a long spear or halberd-like weapon called "Neuntote", which is capable of cutting through Danger Beasts with ease.

Adaptation and Evolution
Its ability to evolve is also shown on several occasions. Once Tatsumi inherited Incursio, the Teigu went through an evolution in order to adapt to Tatsumi's fighting style and to exceed its previous limitations. The armor that enveloped him was noticeably less bulky than it was previously in order to fit Tatsumi's agile form. Tatsumi is able to sense that the armor, after its evolution, has new abilities that he had yet to discover. One example is the ability for Incursio to manifest the head of the Tyrant from any point on the armor to deflect bladed weapons, protecting the user from an otherwise decapitating blow.

This was shown again in the second battle against Esdeath when Tatsumi pushed the armor to its limits, with assuming a new form. In this form, the armor is more segmented, has a more savage, reptilian-based shape with claws on the gauntlets and feet, as well as a secondary pair of eyes on the helmet and the Neuntote spear is much larger than before. As with this evolution, Tatsumi's speed and strength are even greater and the armor can now resist the effects of Esdeath's Demon's Extract and even its Trump Card: Mahapadma and Budo's Adramelech's lightning-based attacks. However, because Tatsumi forced Incursio to evolve rapidly to increase his strength, Incursio started to manifest in one of Tatsumi's eyes. After being examined by a doctor, he reveals that the armor has started to bond with him. He also states that after a few years, Tatsumi could use it without overdoing it like Bulat. Now at the risk of being devoured by Incursio, Tatsumi could only transform 3-4 more times before Incursio consumes him. After countless usages of the teigu, Incursio can now only be invoked once more before it assimilates its host completely. With each successive transformation its user emulates more and more draconian qualities first giving Tatsumi half of Tyran'ts face and horns only to regress into more moderate facial patterns. Secondly sprouting horns, scales, claws and reptilian features on his hands.

Its ability to evolve only strengthened after it fused to its host, during the battle with the altered Cosmina, Incursio gained an immunity to poison due to the trap honest had set. while the second, and during the great revolutionary war where he fought Esdeath to a uneven standstill gaining greater speed and power in battle. After sustaining critical injuries fighting against Shikoutazer in its purge state, The teigu seems to have gained a regenerative capability actually mending both the armor and Tatsumi's destroyed anatomy, giving him newfound wings as well.

Trump Card
The armor's trump card is the ability to turn the user invisible for a certain amount of time, depending on the skill of the user. As noted, a weakness of the invisibility is that while it masks the user visually from the naked eye, it does not hide their "presence", allowing skilled opponents to sense the user despite the invisibility.

Trivia

 * Incursio is the prototype of Grand Chariot.
 * Incursio is Latin for "Invasion".
 * Neuntote, the name of the Spear is German for "Nine Dead People".
 * In the omake segments Akame ga Kill! Theater Incursio is portrayed as an action figure called "Incursio DX".

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