Wizard Well

The Wizard Well was a cistern that filled with water from an underground well. It was located in a room in the basement of the Whistling Wizard inn in Voonlar, on the southwestern edge of the Moonsea region. During the latter half of the 14th Century DR, it was famous throughout the surrounding area because it would talk to individuals who respectfully entered the room one at a time.

Description
The Well was a stone cistern about an arm's-length deep that filled with cool drinking water from a subterranean well beneath the inn. The chamber that housed it had one sturdy door that could be barred from the inside. The water always appeared clear to the bottom of the cistern, but objects thrown into the well disappeared from view regardless of the amount of light present, either above or below the surface of the water. The objects could still be felt and retrieved by reaching into the water, but remained invisible while submerged.

The Well only acknowledged individuals who entered the chamber alone and barred the door behind them; otherwise, the waters remained dark and silent. A visitor merely had to secure the door and then gaze into the Well for a minute or two