who created the walls in attack on titan
Eren Yeager It was then that Eren learns he possess a power that the enemy Titan Shifters seek called "The Coordinate", subconsciously directing a group to kill and devour the Titan that killed his mother and then has them attack Reiner and Bertolt so he and his friends can fall back.[15] After being rescued, Eren is sent with his friends to an isolated village while preparations are made for a campaign to retake Wall Maria for good, by making use of his newfound power. But Eren is then captured by the royal family's patriarch Rod Reiss, who reveals the "Coordinate" was originally in his family for years since their founding ancestor created the walls until it was stolen. Eren also learns that his transformation into a Titan was caused by Grisha, another Titan Shifter, whom he unconsciously devoured to inherit "The Coordinate" which Grisha obtained from eating Historia's half sister Frieda Reiss. Eren realizes by then that Rod Reiss intends to restore his family by having Historia become a Titan and eat Eren, accepting his fate out of guilt for the people he failed to save as he asks Historia to save humanity in his place. However, Eren finds Historia refusing to aid her father as she frees him as Rod becomes an Abnormal Titan while Misaka, Levi, and Jean arrive. Eren ingests a liquid labeled "Armor" that bestows him a new power to harden his Titan form, using it to save himself and his friends from being crushed by a collapsing ceiling before he and the Survey Corps head to the Orvud district where they confront and kill Rod.