In the drowned library of Silthaven, where shelves grew coral and the light came green through deep water, the archivist Kaelen found a scroll sealed with wax the color of rust. The script was neither Old Meridian nor the Knot-Tongue of the Sunken Kings. It read:
When Kaelen woke, his left hand had turned transparent, and through it he saw the true geography of the world: a second ocean beneath the ocean, where words were hooks and every drowned person still sang. danlwd fyltrshkn bywbyw
But "danlwd fyltrshkn bywbyw" might instead be (Caesar cipher): d->c, a->z, n->m, l->k, w->v, d->c → "czmkvc" — not obvious. In the drowned library of Silthaven, where shelves