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Chapter 121 of Attack on Titan , titled "Future Memories," is widely regarded as the most pivotal turning point in the series, fundamentally changing the reader's understanding of everything that came before it. This chapter reveals the true nature of the Attack Titan and cements Eren Yeager’s role as the series' ultimate architect.

The core revelation of Chapter 121 is the Attack Titan’s unique ability: unlike the other Nine Titans, it can see the memories of its inheritors. Chapter 121 of Attack on Titan , titled

They discover that the Attack Titan has never truly obeyed anyone; it has always been guided by future memories, essentially allowing its users to "fight for freedom" across generations. Chapter 121 of Attack on Titan