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There are humans out there...
No, they weren't simply existing. They're thriving...if the words of the void's main consciousness were to be believed, which Cedric definitely does.
What a bomb to casually drop on him, really.
To think that, out there, humans were one of the most respected, prosperous, and largest tribes sounds absurd. Add the fact that the location of this prison turns out to be close to a humann, which filled him with a strange sense of anticipation and wariness.
Odin himself, the creator of the void and this prison, was human too. Who could've thought?