The several mentions of the ChayShan, along with both of the scenes where Shuden performs it, were added to the book to give a feeling of scope. I wanted the reader to understand that there are things in this world that are different from the increasingly-familiar magic and society of Arelon.
We’ll talk a little bit more about this event in the text. However, realize that the ChayShan wasn’t ever intended to be effective or successful—it’s not a Deus Ex Machina for the people trapped inside Elantris. It is a hint of things I plan to do with the future of this world.
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