Silent Fountain
From RPGWiki
A strange cavern, hidden deep beneath the Red Conservatory. It has no natural entrances, a high dome, and the floor is littered with bones and broken weapons. The center is a pool of liquid darkness. The Tatterdemalion has appeared here, and it was here that the Chainshatter Staff was recovered.
According to the Tatterdemalion (and supported by other sources), one effect of the Silent Fountain is to mute the emanations of powerful magic.