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.

The plague didn’t vanish. But Kaelen learned to sing back. Danlwd fyltrshkn bywbyw —a charm to unmake the eels. A key to lock the abyss. A lullaby for the city’s lost sailors, so they would sleep instead of stalk the living. danlwd fyltrshkn bywbyw

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. But "danlwd fyltrshkn bywbyw" might instead be (Caesar

Desperate to understand a plague that turned people’s shadows into hungry eels, he whispered the phrase before sleep. In his dream, a creature of stitched leather and clockwork lungs spoke: Danlwd fyltrshkn bywbyw —a charm to unmake the eels

No translator in the city of tides could parse it. But Kaelen noticed something strange: when he murmured the words aloud, the candles in his study flickered against the wind—though there was no wind.