Ring of Clumsiness

The Jester's Folly, also known as the Ring of Clumsiness is a cursed ring with only negative magical effects on the user. It can only be removed by a remove curse spell from a companion or a priest in one of the temples found on the Sword Coast. It reduces dexterity&stealth to 50% and make spells fail 75% of the times. This ring can be found when the party kills the mages on the first floor of the Sorcerous Sundries.

In-game description
"Ring of clumsiness: 'The Jester's Folly'. The most notorious owner of this ring made a substantial living exploiting its cursed nature. Gregoria the Foole, a jester by trade, would use his incomparable sleight of hand to switch this ring with that of a patsy taken from the audience. The rest of his performance would involve mocking of the newly clumsy individual, much to the delight of their comrades. The ring was removed (by a method known only to the wily Jester) only once the stooge had promised no reprisals for the treatment he had received, though Gregoria frequently still had to make a hasty retreat. His last known performance was rumored to have been an ill-humored mage in Zhentil Keep; a show from which he did not flee quite fast enough."