[...well that's not chilling or anything. The names Erebus and Nyx don't sound familiar, but that doesn't mean they don't exist. "Slumbers behind the wall" - behind, or in? And typical titans Levi wouldn't necessarily consider them to be powerful enough to tear the world itself asunder, though they'd done a pretty good job on humanity already. Perhaps this person knows more about the titans than anyone else, and maybe there's more answers to be had that can help win humanity's survival.]
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Which wall?