[The Dead King had] hardened the metaphysical borders with Arcadia after she’d slipped through there the third, and she supposed that after this one he would make sure his bone wyverns collapsed when they were captured.

- Extra Chapters: Regard

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Hye had passed through there once, but getting anything useful out of her was near impossible. It wasn’t that she lied. That would have been of some use, as even boasts and exaggerations would hold a kernel of truth. No, it was the opposite: she was concise to the point of uselessness. I walked through Arcadia and then cut my way out and then I beat up dead people all the way to Hell. That was the whole sum of how she’d described her experience assaulting Keter through the realm of the fae, to Warlock’s despair.

- Book 4, Interlude: Heretics