Decades ago, a human named Mulmehr discovered a particularly old series of tunnels through the mountains and claimed them for himself. Mulmehr, a scion of the Shahram noble family in Tyr, spent years and much of his resources modifying the tunnels to use them in a psionic ritual. He completed his preparations, attempted the ritual, and apparently failed. Many of the tunnels collapsed, and Mulmehr was never seen in Tyr again.
Whatever the nature of the ritual, the tunnels have since gained a reputation as an evil place that drains all sound from visitors—as well as their willpower and volition. No one can say what lies at the heart of the Echoless Caverns, where Mulmehr scribed the ritual circle, because no one has reached that area and returned to tell the story