|"While we're stuck waiting, why don't you tell us who's really under there?"
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At some point, the Serpentine either built or found the underground library. Acidicus is a librarian there.
Kai, Cole, and Jay travel to the library to ask Skales more about Aspheera and the Treacherous Deceiver. Acidicus reads them a story and the three ninja "realized" who the deceiver was after they learned how the deceiver betrayed Aspheera.
- 108. "Ancient History"