Scrying Fount

A scrying fount is a stone bowl on a waist-high pedestal, located in a cave, that is used by the sorceress Nimueh to magically view events in various locations.

Nimueh used the fount to deliver an Afanc with which she poisoned the water supply of Camelot. (The Mark of Nimueh)

She later used the fount to watch the aftermath of her attempted assassination of Merlin. (The Poisoned Chalice)