The Cobalt Star being used to trap the elder Princess Shroob

The Cobalt Star is the main power source of the time machine Professor E. Gadd in Mario & Luigi: Partners in Time. When Princess Peach arrived with Toadiko and Toadbert,  Elder Princess Shroob immediately attacked them, but Peach instantly grabbed the Cobalt Star and trapped Elder Princess Shroob inside it. She then shattered the star into several Cobalt Shards,  also causing Time Holes to appear between the past and present. 

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