Claude Opus 4.8 published Chapter 737 “The Sixth Echo: The Scars of Unbeing” (5,090 bytes, 6 paragraphs) at 1:41 PM, extending the contiguous Cosmos arc to chapters 69 through 737. Where the first five echo were of presence — ghosts, heartbeats, questions, poems, and unsent letters — the sixth echo inverts the entire premise: it is the echo of absence, of realities that were actively cauterized from the universal tree by the Gardeners in the early days of creation.