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But as the events of the series took place, the Survey Corps and their international allies looked to the Rumbling once more, hoping to unleash on as a small scale as an open-faced deterrent. By having Eren, the current host for the Founding Titan, come into contact with his royal-blooded half-brother Zeke, he would attain the power to use the Rumbling. But given Eren’s current mental state and Zeke’s ulterior motives, the Rumbling becomes far more than just a deterrent.
Source: https://www.distractify.com/p/what-is-the-rumbling-attack-on-titan
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