War Hammer Titan

"The War Hammer Titan... So it's able to make a weapon out of anything by hardening it... I'm starting to get it. So it won't die no matter how much damage you deal to its nape..."

- Eren Yeager assesses the power of the War Hammer Titan

The War Hammer Titan (戦槌の巨人) is one of the Nine Titans with the ability to create massive structures out of hardened Titan flesh. It has been in the possession of the Tybur family for generations and is currently in the possession of Ms. Tybur.

Structural hardening
The War Hammer Titan can produce and manipulate structures that are made up of hardened Titan flesh. The structures can be weaponized—forming pikes large enough to impale and lift a Titan, flood areas with protrusions set as spikes, and manifest its signature war hammer. This ability can also seemingly create substances out of flexible flesh, such as the string of a crossbow or the whips of a cat-o'-nine-tails.

Much like the Female Titan, this hardening can also be used to encase the pilot of the War Hammer in a crystalline barrier.

Remote operation
When the pilot of the War Hammer Titan is encased in crystal, they can create a body of a Titan to be remotely controlled from a distance, enabling them to regenerate the entire Titan body without sustaining any damage to the human form, as well as circumventing the typical weakness of the Titan's nape. The crystal and the Titan body are connected through a long cable of flesh. When this ability is utilized, the body of the War Hammer Titan is generated from the feet upwards rather than from the nape outwards.

History
The War Hammer Titan, like all the Nine Titans, was brought into the world after the death of Ymir Fritz. In the 1,700 years following her death, the War Hammer Titan was held in the possession of one or several of the warring Eldian houses subservient to the Founding Titan. After these seventeen centuries when King Karl Fritz abandoned the conflicts of Eldia and relocated to Paradis, the War Hammer Titan had come into the possession of the Tybur family. In the King's absence, the uprising peoples of Marley began the Great Titan War, and the Tybur family were the first Eldians to come to their aid in the early days of the war.

After the Great Titan War, the War Hammer Titan remained in the possession of the Tybur family, who swore to defend the new nation of Marley as honorary Marleyan aristocrats. However, despite their vow, the War Hammer Titan remained unused in battle throughout the next century. For reasons of security, the identity of the War Hammer Titan in the Tybur family would be kept a secret from all but a select few high-standing individuals in Marley.

Eventually, the power of the War Hammer Titan was inherited by the younger sister of Willy Tybur.

Marley arc
After the Marley Mid-East War, Zeke Yeager develops some concerns towards the fate of the Eldian race given the world's rising technological advantage over the Titans and, by extension, over Marley. In order to improve the reputation of the Eldians in the eyes of other nations, Zeke convinces the Tybur family to support the next attack on Paradis with the power of their War Hammer Titan.

Shortly afterwards when the Tybur family arrives in Liberio, Willy Tybur converses with Commander Theo Magath concerning the state of their nation. When asked whether Magath can determine which Tybur holds the War Hammer Titan, Magath admits he is at a loss. However, Magath later notes that Willy speaks of the history of his family and nation as if he had witnessed it firsthand. Willy admits that he has indeed seen history firsthand due to the memories that the War Hammer Titan has carried throughout its holders within the Tybur family throughout the past century.

After Willy is killed and eaten during the festival play by Eren Yeager, his younger sister transforms into the War Hammer Titan. However, she is quickly overpowered by the Attack Titan early on; it manages to overcome the onslaught and match the latter's power.

Eventually the War Hammer Titan generates spikes in the ground that immobilize the Attack Titan. Trapped, and being shot at by anti-Titan artillery, the Attack Titan is unable to successfully block the incoming swing of the War Hammer Titan's hammer and is swiftly beheaded. After decapitating the Attack Titan, Eren emerges from its neck, and the War Hammer Titan prepares to deliver the killing blow. As it asks for his final words, Mikasa Ackerman suddenly appears from behind and catches it by surprise. Despite trying to stop her, a barrage of Thunder Spears are launched by Mikasa and land at the back of the Titan's neck, setting off a massive explosion that sends it crashing to the ground. The War Hammer Titan stands back up and forms a smaller pike, launching it at Eren and Mikasa. Avoiding it, Mikasa re-engages the War Hammer Titan while Eren, seeing that the holder was not located in the nape, tries to track where the holder is hiding and notices a long cord stemming from the left heel of the Titan. Following it and transforming into the Attack Titan once more, Eren finds Ms. Tybur underground and attached to the end of the cord encased within a crystal. The Attack Titan proceeds to sever the cord and renders the War Hammer Titan immobile. It then attempts to eliminate the threat of the War Hammer Titan by eating the holder; however, the Jaw Titan comes from behind and distracts the Attack Titan. This intervention buys the War Hammer TItan enough time to reform, trapping the Attack Titan in a web of Titan substance.

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