The Whispering Skies refers to the perpetual atmospheric acoustic phenomenon observed on Xylos. It manifests as a low-frequency hum (approximately 14Hz to 20Hz) that varies in intensity depending on the weather and proximity to Chronosite deposits.
The sound is generated by the friction of high-velocity Argon winds passing through the crystalline mountain ranges, particularly near Sector 4. This constant noise pollution requires all human settlements to be constructed using Void-Glass to protect the sanity of the inhabitants. Without protection, the noise can cause nausea, vertigo, and eventual auditory hallucinations.
Conversely, the native ecology relies on this sound. Whisper-Vines grow in the direction of the loudest hums, and migration patterns of Echo-Fauna are dictated by the shifting "melodies" of the wind. Xenometeorologists can predict storms not by looking at radar, but by analyzing the pitch of the sky.
Some researchers believe the Skies are getting louder every year, a potential side effect of the Thorne-Yancy Paradox destabilizing the planet's matter.