Item from Attack on Titan by Hajime Isayama
A Titan that creates weapons and structures from hardened Titan flesh. Wielded by the Tybur family for a century, then stolen by Eren in a single brutal night.
The War Hammer Titan is the craftsman among the Nine — it can generate any weapon or structure from crystallized Titan hardening, limited only by its wielder's imagination and stamina. Swords, spears, crossbows, walls, spikes erupting from the ground — all formed from nothing in an instant. Its unique advantage is that the operator doesn't need to be inside the Titan's nape. Instead, the wielder encases themselves in a crystal cocoon connected to the Titan body by a cable of flesh, making the standard 'cut the nape' strategy useless. The Tybur family held the War Hammer for over a century without ever using it, living as Marleyan nobility while other Eldians rotted in internment zones. When Lara Tybur finally transformed to stop Eren's attack on Liberio, she was skilled but unprepared for someone willing to eat her crystal shell whole. Eren took the War Hammer's power that night. He took a lot of things that night.
Also known as: the War Hammer, War Hammer Titan, the Tybur Titan