Board Thread:Theories/@comment-44086949-20191210042805/@comment-1327106-20191210045730

I doubt we're going going to see the iceburst stone become a time travel maneuver, because Attack on Titan has already established the laws of time travel as they apply to this particular story. AoT operates under a fixed timeline/stable time loop principle. The past (and the future) cannot be changed.

We won't see this rule broken because if it could, then Chapter 121 wouldn't have played out the way it did. That was when Eren and Zeke visited Grisha's memories when he killed the Reiss family. Chapter 121 literally only exists so Eren could visit his father's memories and ensure past Grisha could be persuaded into forming the timeline as we know it.

My feeling is that Eren will succeed in his plan as far as his vision of the future has shown him (because the timeline cannot be changed), but the future has a silver lining that no one besides possibly Eren is currently aware of.