Eren Yeager stole the Founding Titan, plunging the once peaceful world back into danger.
As Eren was not of royal blood, he was not bound by King Fritz's vow of non-aggression. The three walls on Paradis Island were constructed from tens of thousands of colossal Titans, controlled by the power of the Founding Titan. These walls served as an unparalleled shield and an unstoppable spear.
If Eren were to reanimate these Titans with the power of the Titans and enact the Rumbling, all civilizations on Earth would be annihilated. While weapons capable of countering Titans had been developed in the current war, weapons that could stop the rampage of countless colossal Titans would likely never appear.
Once the Rumbling was initiated, the nations of the world would be helpless. Humanity would have no choice but to flee in disarray from the approaching doom. Meanwhile, in the basement, Eren was slowly regenerating his severed limbs with Titan power. Witnessing this, Reiner finally realized that the man before him was Eren Yeager, and only then did he truly grasp the foolishness of his actions.
The letter Eren had previously sent for help was not to his family, but to his comrades on Paradis Island. Hearing this, Reiner immediately understood that the Survey Corps had infiltrated Marley.
Eren then calmly said to Reiner, "Just as Willy Tybur said, we are the bad guys. Our existence might destroy this world, but in our eyes, you are also bad guys."
"When you destroyed the walls, when my homeland was ravaged by Titans, when I watched my mother get eaten by a Titan, from that day forward, you should have anticipated revenge."
Eren then questioned Reiner, "Why did those innocent people have to endure such hell on earth, to be devoured by Titans? Why did my mother have to be eaten by a Titan that day? Why did you have to destroy the walls? I simply cannot understand."
Reiner's trembling, subservient whisper answered, "It was because we were on a mission. We infiltrated the inner walls amidst the chaos to spy on the king within, to then reclaim the Founding Titan and ultimately save the world."
Eren sarcastically expressed understanding, "So it was to save the world. If it was to save the world, then there's nothing that can be done." Reiner said fearfully, "I remember you said you'd make us suffer as much as possible. You came here for that, didn't you?"
However, Eren stated that he had long forgotten whether he had said such things. Eren said, "I truly viewed everything across the sea as my enemy. But when I crossed the sea and came here..."
"Living under the same roof with enemies, eating the same meals as enemies, just like you did back then, Reiner. There are evil people here. But there are also kind-hearted people. It's the same whether it's across the sea or inside or outside the walls."
"But from birth, you were fed false and extreme ideologies by Marley. This is the fault of the era and the environment. Reiner, you've always been in pain, haven't you? I can understand your feelings now."
Hearing this, Reiner collapsed to his knees, confessing his sins. The weight of his past misdeeds was driving him mad. At this moment, he only wanted to confess all his transgressions.
"That day, after Marcel was eaten by a Titan, Armin and Jean were ready to abort the mission and return immediately, but I forcefully convinced them to continue. It was for my own self-preservation, and so I could become a hero. I acted like an older brother in front of you because I wanted to be praised."
"This is not the fault of the era or the environment. These are all my own wrongdoings. Your mother was eaten by a Titan, and that is entirely my fault."
Reiner loathed himself to such an extent that he pleaded with Eren to kill him as atonement.
Meanwhile, Willy's speech continued. Willy spoke with eloquent sincerity, "I truly wish I had never been born into this world. I hate my Eldian blood more than anyone. I even wish for all Eldians to perish completely. But I don't want to die, because I have already been reborn into this world. Although our nationalities and races differ, if there is anyone who doesn't want to die, please lend me your strength."
"I want to fight against the demons of Paradis Island with all of you. Therefore, for world peace, I hereby formally declare war on the hostile forces of Paradis Island." The audience below was moved to tears by Willy's speech. At this moment, they had made their choice. And Eren, listening in the basement, had also made his choice.
Eren extended his hand to Reiner, pulling him up from his kneeling position. Eren said with resolute eyes, "I will keep moving forward until all enemies are driven out." A golden flash erupted from Eren's palm, and charging Titans instantly swept across the entire festival stage. "So now, everyone only needs to think about one thing, and that is to fight."