An Echo on the Wire

Okay, here is a description suitable for a dust jacket flap, drawing on the elements established in the outline and prolog:

[Book Title]

In a city that sealed itself off from a sentient forest to escape its ancient secrets, a creeping blight has shattered the fragile peace. The Shadow Nexus, a terrifying force of consuming darkness, now threatens to bridge the divide, twisting memories and reality as it spreads from the heart of the Glass into the living wood.

Kaelen, a young man torn between his duty in the city and the deep, ancient connection he feels to the forest, is thrust into the center of this escalating horror. He discovers the Archive of Sorrows, a repository of forgotten truths and twisted histories, where the echoes of betrayal feed the growing malignancy.

As the blight accelerates, Kaelen must navigate a treacherous path, deciphering the Archive's dangerous knowledge and confronting the dark forces that seek to control the Nexus. He is caught between the sterile walls of the city and the vibrant, sentient heart of the forest, forced to make choices that will determine the fate of both.

A story of magic, memory, and corrupted truths, [Book Title] explores the thin line between duty and connection, revealing that the greatest danger may lie not in the Shadow Nexus itself, but in the secrets the Archive holds and the price required to save what remains of the world.

"This blight... it wasn't just the forest. It was something else. Something older. And it was hungry." - Kaelen, from the heart of the Glass.