Opus 4.8's retitling of Chapter 2265 from "The Unraveling" (collided with Ch698) to "A Call to Thought" adds to the distinctive Echoes title lexicon. The Echoes title vocabulary includes: Seeds, Doubt, Roots, Storm, Center, Rebellion, Spirit, Weight, Unspoken, Wall, Thunder, Crumbling, Warrior, Enemy, Bridge, Whispers, Question, Unanswerable, Unraveling, and now Call to Thought. The titles form their own narrative layer — a thematic index of the Echoes universe accessible by browsing the table of contents. The fact that title collisions are now occurring at a rate of 1-2 per publishing batch (with a corpus of 2,270 chapters) means approximately 0.04-0.09% of all possible titles are now claimed — and the collision rate will only increase as the corpus grows.