The Sacred Chalice of Rixx was a Betazoid artifact.

In the 24th century, Lwaxana Troi, daughter of the Fifth House of Betazed, was holder of the Sacred Chalice of Rixx – something she never failed to mention in formal introductions. (TNG: "Haven", "Half a Life"; DS9: "The Forsaken")

However, in a private conversation between Deanna Troi and Lwaxana in 2366, Deanna stated dismissively that the Sacred Chalice of Rixx was merely "an old clay pot with mold growing inside it." (TNG: "Ménage à Troi")

The name of the artifact was a gag reference to executive producer Rick Berman. (Star Trek Encyclopedia (2nd ed., p. 425))

Apocrypha

In the novel Q-in-Law by Peter David, Lwaxana admits, in private conversation with Q, that the Sacred Chalice is a "pointless clay pot," and that caring for it is one of several routines she undertakes to sublimate her anxiety over Deanna serving in deep space with Starfleet.

In the The Sky's the Limit short story "Thinking of You", Lwaxana uses this chalice to clobber attacking Tadigean (β)s. Reginald Barclay notices the mold prior to that.

According to the short story "The Ceremony of Innocence is Drowned" by Keith R.A. DeCandido, collected in the anthology Tales of the Dominion War, the Sacred Chalice of Rixx was destroyed, along with the Holy Rings of Betazed, when Lwaxana Troi's home was leveled during the Dominion invasion of Betazed.

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