Maybe it’s just a simple on each letter:
One night, the moon bled silver, and the five were summoned by a dying star that fell into the courtyard of the Tower. The star whispered: “The Void is learning to speak. You must teach it to forget.” afdl ttbyq radyw byn sbwrt
The Void answered with a sound like breaking childhood. Sbwrt then cut that sound in half, and the two halves became a door. Beyond the door was a garden where every forgotten name grew as a flower. Maybe it’s just a simple on each letter:
Instead, look at last word sbwrt: s→r, b→a, w→v, r→q, t→s → “ravqs” no. the moon bled silver