attack on titan

Cases:
The Scout Corps (Reconnaissance Regiment) are warriors who go beyond the walls to fight and study the titans.
Garrison (Garrison Corps) - a guard that protects the walls and maintains order in cities.
The Military Police (Military Police Corps) is an elite force in the capital that enforces laws and protects the king (only the best of the best are allowed into their ranks).

Building a fortress for safety from titans:
Wall Maria (outer) is surrounded by two other walls. People living near it are considered cannon fodder.
Rose (medium). Surrounds the last wall.
Sina (inner). Surrounds the city of Mithra, where the aristocrats live.

The UPM is a spatial maneuvering device, a special set of equipment for flying and fighting Titans.
How the UPMRbelts work: A system of tight belts distributes the load across the entire body during sudden acceleration.
Gas cylinder and motors: Compressed gas powers the rope winding mechanism.
Harpoon Grapples: Fire at walls or Titan bodies to pull them in and swing them around.
Blades: Removable steel blades in the handles, used to strike the Titans' weak point - their heads

Pure Titans: All Pure Titans were originally humans of the Eldian race (Ymir's Subjects). They transform into monsters when Titan spinal fluid enters their bloodstream. A lightning bolt then flashes, and the human's form is permanently lost.
Types: Small (3-4 meters), medium (5-7 meters), large (8-15 meters)
Command: brain destroyed, run into large crowds, eat people. They have no organs or digestive system.
How to kill: cut a deep slit in the flesh of its neck (the back of its head). The vulnerable area is approximately 1 meter long and 10 centimeters wide. This is where the human spinal cord is located, having dissolved into the giant's body during the transformation.

Intelligent Titans are humans who possess a portion of the Titans. They can transform into Titans if they injure themselves, provided they so choose. After their first transformation, they are given a lifespan of 13 years.

The Progenitor Titan (Founder): The most powerful Titan. Controls other Titans and alters the memories and anatomy of Eldians. (Located in Eldia)

Attack Titan: Possesses the will to always fight for freedom and can see the memories of past and future owners. (Located in Eldia)

Colossal Titan: A massive giant (approximately 60 meters). Capable of causing a powerful explosion when transforming and emitting scalding steam. (Not found in Eldia)

Armored Titan: Covered in a tough, hard skin-like armor that protects against most attacks, but at the cost of speed. (Not found in Eldia)

Female: A versatile Titan with high mobility, the ability to summon mindless (pure) Titans with a scream, and partially bury flesh into armor. (Not currently in Eldia)

Beast Titan: Resembles an animal (monkey, ram, etc.) in appearance. Strong in throwing objects, and if possessing royal blood, controls regular Titans. (Not in Eldia's ranks)

Warhammer Titan: Capable of creating any weapon (hammers, spikes, swords) from hardened flesh and controlled remotely from a crystal. (Not found in Eldia)

Titan Carrier (Carrier Titan): Moves on all fours, has immense endurance, and can carry heavy loads or guns. (Not found in Eldia)

Tooth Titan: A small but very fast giant with powerful claws and teeth capable of piercing any armor. (Not found in Eldia)

2,000 years ago, a little girl named Ymir was a slave in the cruel Elditz tribe. For a minor misstep, she was released into the forest and then hunted. Ymir hid in a tree crevice, but immediately fell into an underground lake, where the being "Source of All Livingness" possessed her spine and spinal cord.

Ymir became the first Titan, but was unable to lead a rebellion. King Karl Fritz made her his concubine. Ymir gave birth to three children: Maria, Rose, and Sina.
After Ymir's death, her children ate their mother to steal her power. After this, nine types of Titans emerged, known as intelligent Titans: the Progenitor Titan, the Attack Titan, the Colossal Titan, the Armored Titan, the Female Titan, the Beast Titan, the Tooth Titan, the Carrier Titan, and the Hammer Titan.

After 2,000 years, the new king, realizing how cruel the previous rulers had been, engineered his own defeat, took a small portion of his people (the Elditz), and moved to Paradis Island. There, he erected three walls: Maria (outer), Rose (middle), and Sina (inner), which were created from sleeping titans. The king erased the memory of the empire's history from the entire people, leaving them ignorant of all its affairs.