The Everfilling Chalice

A cup of nidua which is always full. Said to summon the ghost of a woman who converses with whomever holds it. The cup appears to be made of simple clay, but is functionally indestructible.
Note that the cup can't be used to flood areas. Should it be tipped over, the ghost will 'appear' to right it. In cases where it's past horizontal, the cup will cease to bring forth more nidua until reset. Attempting to game this will result in the ghost appearing to admonish the invidual in question, and the cup ceasing to generate liquid for arbitrary lengths of time.