The source chapter content was not provided. To rewrite the chapter and preserve plot beats exactly, transform names, setting details, and prose voice as requested for 'The Serpent's Coil', the original text is essential. Please provide the content of 'Chapter 18' from the source work. Without the source text, I cannot identify the plot beats, character actions, dialogues, or specific descriptive elements that need to be adapted to Kael's perspective, the Veridian Empire's setting, and the specified narrative voice.

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