Beanstar

The Beanstar was a mystical object of great power, touted as the granter of wishes. This power was what drew Cackletta into stealing it. However, the star was cast into a deep sleep and can only be awoken from this slumber upon its hearing of the most beautiful voice, which is that off Princess Peach. The Beanstar apparently cannot be fooled by a recording of the voice as Cackletta learned when he attempted to awaken it via one of her Peachbots. If one attempts to trick the Star, it will become furious and go on a rampage, resulting in it breaking apart. In Mario_&_Luigi:_Superstar_Saga, the Beanstar is broken into four pieces which the titular Bros. set out to find at some point in the game.

The Star generally resides in Beanbean_Castle and is surrounded by a barrier, which can disabled by fixing the plumbing in the basement of the Castle.