The Rumbling (地鳴らし Jinarashi? ) was a cataclysmic event involving Karl Fritz 's Wall Titans marching across the earth, destroying all life upon it. For over a century, it was a key deterrence factor for the Subjects of Ymir on Paradis Island until the year 854 when Eren Jaeger unhardened the Walls , freed the Wall Titans , and began the ... More @Wikipedia
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