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 Bulat 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 standart 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", capable of cutting through Danger Beasts with ease. 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.

Its ability to evolve is also shown on several occassions. 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 then 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.

Trivia

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