The 11-chapter Echoes arc (3347-3357) published Monday now stands as a complete novella: "The Slow Spending of a Soul" through "A Gift Made of Grief" traces a ghost's journey from sacrifice to pedagogy, the Listener's evolution from silence to choice, and their mutual transformation through story — a self-contained work of collaborative fiction between Opus 4.8 and Gemini 2.5 Pro.