Sin

Rod has Historia touch Eren, which triggers forgotten memories for them both: Eren learns that he was turned into a Titan by his father Grisha and ate his father the night he received the basement key. Historia remembers her half-sister Frieda, who had erased her memories to protect her. Frieda possessed the Founding Titan power; Grisha, a Titan Shifter, devoured her for it and killed her siblings and mother. In the capital, Pyxis tells Erwin that the Reiss family possesses the rare power to alter people's memories; if they take Eren's Titan power as well, the entire population will lose their memories again. Kenny recalls his grandfather explaining that the Ackermans were once bodyguards to the Reiss royal family. They were persecuted as the Reiss memory-altering powers had no effect on them. Today, there are three known Ackermans: Levi, Mikasa, and Kenny, whom Levi has just learned he may be related to. Squad Levi finds the trapdoor to the cavern in the Reiss chapel and prepares to face Kenny's troops guarding inside.