Nine Titans

"After her death, Ymir's soul was split into nine Titans, who built the Empire of Eldia."

- Mr. Yeager recounts the origins of the Nine Titans to Grisha

The Nine Titans (九つの巨人) were nine Titan powers that had been passed down through the Eldian people for nearly 2,000 years after the death of Ymir Fritz until the death of Eren Yeager, with each having their own name. The nine Titan powers were the Founding Titan, the Attack Titan, the Colossus Titan, the Female Titan, the Armored Titan, the Beast Titan, the Jaw Titan, the Cart Titan and the War Hammer Titan.

History
Around 2,000 years ago, Ymir Fritz obtained the power of the Titans and became the first Titan, which is the Founding Titan. Thirteen years later, she died and her power was then split into three by her daughters who devoured her. Eventually, the powers split into the individual Nine Titans, which were subsequently inherited by nine of her descendants. The Nine Titans soon destroyed the ancient nation of Marley and conquered the entire continent to build the Eldian Empire. As family relations play a significant role in passing and inheriting memories from the previous inheritors of the Titans, the Nine Titans normally resided within noble families during Eldia's reign. Examples include the Fritz family with the Founding Titan and Tybur family with the War Hammer Titan.

The noble families who held the Nine Titans, other than the Fritz family, were in a constant state of conflict with each other, but the Founding Titan had maintained the peace. When the 145th King, Karl Fritz, inherited the Founding Titan, he held great shame for the actions of his people and carried sympathy for Marley. He conspired with the Tybur family as atonement for the actions of their ancestors and fabricated the story of Helos, a Marleyan hero who defeated King Fritz. They succeeded in inciting a civil war, the Great Titan War, with the help of the people of Marley and while Eldia collapsed from the inside, Marley seized control over seven of the Nine Titans, with only the Founding and Attack Titans escaping their grasp. They distributed the Titans they had (with the exception of the War Hammer Titan) among Eldians loyal to them known as Warriors. Karl Fritz then moved many Eldians onto Paradis Island and built the Walls by creating thousands of Colossus Titans, which hardened to form three concentric walls. The king then erased the memories of the Eldians on the island, except for a few minority races which were immune.

The Tybur family was allowed to keep their Titan because they were the first to fight for Marley, leaving them and the Reiss family (the renamed Fritz family) the only remaining Eldian houses left with their Titan after the war. The Reiss family later lost their Titan to Grisha Yeager in the year 845. After Grisha's Attack Titan ate Frieda Reiss's Founding Titan, the two Titans mixed into one; this resulted in the number of Titans being reduced to eight. The number was reduced again years later when Eren Yeager's Attack Titan consumed the younger sister of Willy's War Hammer Titan, bringing the number of Titans down to seven.

Names and attributes

 * The Founding Titan (始祖の巨人), by screaming, could turn Subjects of Ymir into Titans, control the minds of Titans, and alter the memories and bodies of Subjects of Ymir, but only if the inheritor had royal blood or was in contact with a Titan of royal blood. It was connected to all Subjects of Ymir and Titans via paths.
 * The Armored Titan (鎧の巨人) was covered by hardened, armor-like skin, except in key areas necessary for movement, it also possessed the ability to harden its arms and feet into sharper claws which could be used to climb structures such as the Walls.
 * The Attack Titan (進撃の巨人) could receive memories from both past and future inheritors of the Titan. Guided by these memories, it always moved ahead, fighting for freedom.
 * The Beast Titan (獣の巨人) could take on the physical characteristics of different animals that vary between its inheritors.
 * The Cart Titan (車力の巨人) was quadrupedal and had great endurance that allowed it to stay transformed for long periods of time, as well as transform in rapid succession without needing to rest, hundreds of times per day even. Its speed rivaled that of the Jaw Titan.
 * The Colossus Titan (超大型巨人) was enormous and could emit immense amounts of steam from its body like a blast furnace, at the gradual cost of its muscle tissue. The user was able to control the Titan's transformation power and blast radius.
 * The Female Titan (女型の巨人) could inherit abilities much more easily than any of the other Titans. It could also harden areas of its skin for extra offensive and defensive capabilities. It also had the ability to summon pure titans with its scream.
 * The Jaw Titan (顎の巨人) was the swiftest of the Nine Titans and had sharp, hardened teeth and claws capable of breaking almost anything.
 * The War Hammer Titan (戦鎚の巨人) could materialize various weapons and structures from its own hardened flesh. It could be controlled from afar through a cable of Titan flesh while the user remained hidden within a hardened crystal casing.

Physiology
The heights of the Nine Titans varied greatly: the Cart and Jaw Titans were small at 4 and 5 m, respectively, and the Colossus Titan was enormous at 60 m. The rest hovered around 15 m, with the Founding and Female Titans being slightly smaller at 13 and 14 m, respectively; the Beast Titan being slightly larger at 17 m; and the Armored and Attack Titans being exactly 15 m. The War Hammer Titan was also around 15 m.

These heights ware definite and it did not matter what the height of the Pure Titan was before inheriting the power of the Titans. For instance, Eren's Pure Titan was originally 4 m, but grew to 15 m after inheriting the Attack Titan, and Armin's Pure Titan form grew from barely being tall enough to look over the buildings in Shiganshina to the immense 60 m size of the Colossus Titan. The opposite was also known to occur; the Pure Titan form of Falco Grice was approximately the same size of the Armored Titan, but shrank down to 5 m upon receiving the power of the Jaw Titan.

If an inheritor possessed two or more Titan powers, it appeared that one of them would take precedence over the others. Eren Yeager had both the 13 m Founding Titan and the 15 m Attack Titan, but his Titan form was 15 m.

Age does not affect the appearance of the Nine Titans. The Warriors' Titan forms remained constant through their childhood and into early adulthood. The only thing that may have changed is the hair, for example, Reiner Braun's Armored Titan's hair changed as he aged.

Some Intelligent Titans could talk while others could not. Those who could not talk had mouths that physically prevented them from proper speech, such as Eren's. The ones that could talk include Ymir, Zeke, Pieck, and the younger sister of Willy. Speech was not defined by the Nine Titans, as Ymir could talk in her Titan form while Porco Galliard could not, despite them both having the Jaw Titan. The fact that even some Abnormal Pure Titans were capable of speech implies that the ability to speak is completely arbitrary.

Inheritors of the Nine Titans did not adopt the appearance of the previous owners' Titans, as both Ymir and Frieda's Titans' appearances were vastly different from Marcel Galliard and Uri Reiss's Titans, respectively. The current inheritor's Titan form did experience certain changes depending on which of the Nine is received, as Ymir's Titan form gained sharp claws and teeth after acquiring the Jaw Titan and Armin's Titan form became much larger after acquiring the Colossus Titan. Eren's Pure Titan form was much smaller than his current form, and both Ymir's Titan form and Frieda's Titan form were noticeably more emaciated than their Titan bodies after inheriting their Titans.

Some of the Titans had been shown to possess the ability to harden. The Armored Titan was particularly skilled at this, being able to naturally harden its entire body. It could also control the areas of hardening, removing armor for more mobility or creating claws on its fingertips and toes. The Jaw Titan had naturally hard teeth and claws; this hardening was much stronger than normal hardening. The Female Titan was also capable of hardening: Annie was able to selectively harden regions of her Titan and even create a protective layer around her human body. The War Hammer Titan took it a step further and could make structures and even weapons out of hardening. The Attack Titan did not have this as an innate ability, but it could still be gained through specialized serums, such as the case with Eren. Zeke's Beast Titan could also harden parts of itself, such as the nape.

End of the Titans.
When Mikasa Ackerman cut Erens head off, Ymir appeared chosing Mikasa and mikasa thought ymir how to love, setting Ymir free ending the 2000 year titan wars and repealing all titans and titan shiters their power from earth. That means everyone who became a titan would finally be human again and Annie, Reiner, Armin, and Falco will go back as humans and would never become titans again. Humanity won.

Trivia

 * Many transformed Titan forms are modeled after mixed martial artists. For instance, the Armored Titan is modeled after and the Attack Titan is modeled after.
 * Grisha Yeager consuming the Founding Titan and Eren Yeager consuming the War Hammer Titan are the only known cases where a person inherits one of the Nine Titans while already having one.
 * When inheriting the War Hammer Titan, Eren's eyes light up. Similarly, a light is also shown in Frieda's eyes when she was influenced by Karl Fritz's vow of renouncing war.
 * Inheritors of the Nine Titans retained some traits in terms of appearance to their Pure Titan forms. For example, Eren's Attack Titan had a jagged jawline which resembles his Pure Titan form's jaw and Armin's Colossus Titan form shared his Pure Titan's lack of a nose. Reiner and Bertolt also recognized Ymir's Jaw Titan as the Pure Titan that ate Marcel.
 * Inheritors typically tended to lose control of themselves during their first transformation into a Titan.

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